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IGEL Zero RFX
Manual
IGEL Technology GmbH
IGEL Zero RFX
21.02.2014

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  • Page 1 IGEL Zero RFX Manual IGEL Technology GmbH IGEL Zero RFX 21.02.2014...
  • Page 2: About This Manual

    About this Manual All illustrations and descriptions in this manual relate to Version 5.02.100 of the IGEL Linux firmware. This manual is divided into the following sections: Introduction (page 7) General information about the product Quick installation (page 8) Setting up the thin client for the first time...
  • Page 3: Important Information

    If you have any questions regarding an IGEL product and are already an IGEL customer, please contact your dedicated sales partner first. If you are currently testing IGEL products or your sales partner is unable to provide the help you need, please fill in the support form after logging on at the IGEL Support Portal https://www.igel.com/en/members-area/login-logout.html.
  • Page 4: Table Of Contents

    Contents Quick Installation ...............................8 1.1. The IGEL Linux Desktop ........................9 Boot Procedure ..............................11 2.1. Boot Menu ........................... 11 2.2. Network Integration ........................13 2.3. X-Server ............................13 Application Launcher ............................14 3.1. General System Information ......................15 3.2. Sessions ............................15 3.3.
  • Page 5 Devices ................................76 10.1. Printers ............................76 10.2. USB Storage Devices ........................79 10.3. USB Access Control ........................80 10.4. PC/SC Interface ..........................81 Security ................................82 11.1. Password ............................82 11.2. Logon Options ..........................82 IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 6 11.3. AD/Kerberos Configuration......................86 Firmware Customization ..........................88 12.1. Custom Application ........................88 12.2. Custom Commands ........................88 12.3. Custom Bootsplash ........................89 12.4. Environment Variables ......................... 90 12.5. Features ............................90 Index ................................91 IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 7: The Igel Linux Firmware

    This means "zero" local management for you. The structure of the IGEL setup is virtually identical on all zero clients and in the Universal Management Suite (UMS) management software. As a result, the configuration parameters in the local device setup can be found in the same location in the tree structure as a profile used in the management software for example.
  • Page 8: Quick Installation

    Start the thin client and wait until the graphical user interface has loaded. Click on the Setup symbol in the taskbar, or launch the IGEL Setup using the key combination Ctrl Select the system language and keyboard layout under User Interface →...
  • Page 9: The Igel Linux Desktop

    1.1. The IGEL Linux Desktop After the system starts, you will see the IGEL Linux desktop. Figure 1: IGEL Linux desktop The following components can be found in the taskbar at the bottom edge of the screen: • Start menu (also IGEL menu) •...
  • Page 10 • Search for finding functions in the Start menu • Buttons for shutting down restarting the system Figure 2: IGEL Start menu with application and system area IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 11: Boot Procedure

    This can be used to execute common commands (such as ifconfig etc.) when searching for and rectifying faults.  Enter init 3 to close this shell. The boot procedure will then resume. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 12: Emergency Boot

    Our service department will send you a so-called Reset to Factory Defaults Key specially for your device. To ensure that the process is as straightforward and yet as secure as possible, each key is valid for just one device. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 13: Network Integration

    There are three possible ways of integrating the terminal into the network environment. Depending on the terminal's settings, you can choose between DHCP, BOOTP or a manually configured IP address. 2.3. X-Server The final step in the boot procedure involves starting the X-Server and the local window manager. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 14: Application Launcher

    Because the setup program is the central configuration tool for all thin client settings, a setup session is already pre-defined under Sessions and System. Sessions (page 51) System (page 16) License (page 17) About (page 15) Network information (page 17) Shutting down and restarting a device (page 18) IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 15: General System Information

     Applications can also be launched automatically and a key combination (hotkey) can be defined. The available options for launching a session can be defined under Desktop Integration in the session configuration. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 16: System Tools

    3.3. System Tools On the System page, you can run various tools including the firmware updating tool with the pre-set update information. Figure 5: Application Launcher - system tools IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 17: License

    Launches the IGEL Setup. Smart Card personalization Allows access data and sessions which are to be available to a smartcard user to be written to an IGEL smartcard. System information Shows information regarding hardware, the network and connected devices. System log viewer Shows system log files "live"...
  • Page 18: Shutdown And Restart

    You can change the standard action when shutting down the device using the button on the screen or the on/off button on the device itself in the setup under System → Energy → Shut Down. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 19: Setup Application

     Click on Cancel if you have not made any changes and would like to abort the setup.  Click on to save your changes and exit the setup. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 20: Setup Areas

    Three navigation buttons are available. The buttons allow you to move back and forth between the setup pages you have visited or reach the next level up within the structure. You will find a more detailed description of the individual setup options elsewhere. This is merely a brief overview. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 21: Enable Setup Pages For Users

    Enable Setup Pages for Users If a password was set up for the administrator, the IGEL Setup can only be opened with administrator rights, i.e. after entering the password (see Password (page 82)). However, individual areas of the setup can be enabled for the user, e.g.
  • Page 22: Quick Settings

    4.3.2. Quick Settings If a password was set up for the administrator, the IGEL Setup can only be opened with administrator rights, i.e. after entering the password (see Password (page 82)). However, individual areas of the setup can be enabled for the user, e.g. to allow them to change the system language or configure a left-handed mouse.
  • Page 23: Setup Search

    Select one of the hits. Click on Show Result and you will be taken to the relevant setup page. The parameter or value found will be highlighted as shown below. Figure 10: Setup search IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 24: System Settings

    Remote management (page 25) VNC (mirroring) (page 26) Remote access (SSH / RSH) (page 27) Energy (page 27) Firmware configuration (page 27) IGEL System Registry (page 28) 5.1. Time and Date Click on Time and Date to open this dialog page.
  • Page 25: Update

    Buddy Update, you can specify your thin client as an update server for other IGEL thin clients. If you use a thin client as an update server, only the FTP protocol can be used to update the firmware. A number...
  • Page 26: Remote Management

    5.3. Remote Management If the thin client is registered by an IGEL UMS server, the server address and the port number will be shown under Remote Management. You can also enter these data manually if the client is to be managed by a specific server.
  • Page 27: Remote Access (Ssh / Rsh)

    Allows you to mount your own system commands and call up applications at specific times (rc.custom) Custom bootsplash Allows you to replace the IGEL start logos with your own graphics Environment variables Allows you to use dynamic parameters when configuring a number of...
  • Page 28: Igel System Registry

    Incorrect parameter settings can easily destroy the configuration and cause the system to crash. In cases like these, the only way to restore the thin client is to reset it to the factory defaults! You can search for setup parameters within the IGEL Registry by clicking on the Parameter Search button.
  • Page 29: User Interface

    16 bits per pixel (High Color / 65,000 colors) • 24 bits per pixel (True Color / 16.7 million colors) Make sure that all screens connected to the thin client support the color setting. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 30 Screen configuration Every screen connected to the IGEL UD device can be configured independently. The position of the individual screens can be determined in relation to Screen 1. Click on the Identify button to show the screen identifier on each device.
  • Page 31: Access Control

    With the help of the following five dialog fields, you can configure the look and behavior of the desktop, windows, taskbar, pagers (virtual screens) and start menu. Only the pager mask is described in detail. You should therefore refer to the tool tips for all other masks. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 32 Background image Here you can set up the desktop background image with pre-defined IGEL backgrounds, a fill color or a color gradient. You can also use a background image of your own. You can set up a separate background image for each monitor that is connected to the thin client.
  • Page 33: Language

    Select the system language from the list. You can also set the keyboard layout and the entry language depending on the system language. The chosen language is the language for the user interface and therefore applies for all local applications. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 34: Input

    NumLock is to be automatically enabled during the boot enabled procedure.  You can define additional keyboard layouts which can be selected by the user. The layout can be selected in the taskbar. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 35 To ensure that you can open the setup and navigate within it, the initial configuration should take place with a mouse and keyboard connected. The setup procedure with a screen keyboard is described below. A list of the touchscreens currently supported by IGEL Universal Desktop Linux can be found in the IGEL 3rd party hardware database https://www.igel.com/en/service-support/linux-3rd-party-hardware-database.html.
  • Page 36 The Smart Common Input Method (SCIM) platform offers entry methods for over 30 languages under Linux. You can enable one of the methods provided by the IGEL system for Chinese character sets (Simplified Chinese, Traditional Chinese) or manage generic tables for describing the entry method.
  • Page 37: Keyboard Commands - Hotkeys

    You will find a list of existing keyboard commands for window management here. A keyboard combination can be defined for each function. Figure 15: Keyboard commands 6.5. Font Services You can import further font sets in addition to the ones provided by IGEL: • XC font service (page 37) •...
  • Page 38: Nfs Font Service

    If this option is enabled, local fonts are to be used before a request is sent to the font server.  Click on Enable to enable the entry.  Export the font directory to the server via NFS read-only for the thin client. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 39: Network

     Choose between automatic network setup with the protocols DHCP and BOOTP or manual network configuration in order to set the thin client for each network interface. Figure 16: LAN Interfaces IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 40 If you have to use a gateway to forward the data packages to and from the target network, click on Enable and enter the gateway IP address. Give the local name of the thin client. Otherwise, the standard name IGEL-<MAC Terminal name address> will be generated. Enable DNS...
  • Page 41 EAP-TLS/Password for private key Password for accessing the encrypted private key in the private key file. For IEEE 802.1x authentication purposes, the client certificate can also be requested and administered via SCEP. See Network/SCEP (page 46). IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 42: Wireless (Wifi)

    Select the packages or messages with which the thin client can be started via the network. Figure 17: Wake-on-LAN options 7.2. Wireless (WiFi) If you use the optional IGEL WLAN modules or have installed a wireless LAN card (USB, PCI) of your own, you can configure the Wireless LAN interface in this dialog field.
  • Page 43: Dhcp Options

    You can set up additional network routes on the next three setup pages (Routing). 7.4.2. 3rd Party VPN-Clients IGEL Universal Desktop Linux v5 includes two clients from other manufacturers for access to a VPN: Cisco (page 43) GeNUCard (page 44) Cisco You will find the configuration parameters for the Cisco Client in the IGEL setup.
  • Page 44 Figure 19: GeNUCard configuration A valid combination of connection and user data can be pre-populated in the IGEL setup: Network→VPN→GeNUCard→Options. Figure 20: Automatically establishing connections A facility for automatically establishing a connection during the boot procedure can also be enabled. This is necessary when updating the IGEL firmware via the VPN for example.
  • Page 45 Enter a user name and password. Click on Login. The Internet/VPN window will open. Figure 21: Internet/VPN window In the Internet area, configure the connection with the help of the Create, Edit, Delete buttons. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 46: Simple Certificate Enrollment Protocol - Scep

    New certificates will be requested before the old ones expire. In this case, the still-valid certificate will serve as a means of authentication.  For the purpose of checking validity, define an interval (checking frequency) and a period of time which certificate renewal must occur. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 47: Checking The Client Certificate

    While the above-mentioned method for Ethernet connections will also function via the UMS, the initial configuration of the WLAN can only be performed on the client as the WLAN is disabled by default. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 48: Routing

    NFS on the relevant pages of the manual for your server operating system. The procedure for sharing files via the NFS server is as follows: to open the dialog window for NFS.  Click on You can then enter the following: IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 49 The SMB mount is enabled by default and is mounted each time the system boots. Writable for users If this option is enabled, the user who is logged on can write data. Otherwise, this is only possible via root. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 50: Proxy

    7.9. Proxy Select the communication protocols for which a system-wide proxy is to be used. Figure 22: System-wide proxy IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 51: Sessions

    Sessions Application sessions can be created and configured in the Sessions sub-structure of the IGEL setup application. The Session Overview provides an overview of all available session types and existing sessions. Figure 23: Session overview  Click on to create a new session.
  • Page 52 Domains Allows you to add domains which are to be available. If you enter a number of domains, these will be shown in the Domains drop-down area in the login module. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 53: Drive Mapping

    If the drive letter you have selected is no longer available on the server, the specified directory or local drive will be given the next free letter during the login. Give the path name of the local directory to which the mapping is to refer. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 54: Serial (Com) Ports

    Devices→Printers→CUPS→Printers page and must be enabled there for mapping in RDP sessions. Because the thin client merely places incoming printer jobs in a queue, you need to install the printer on the server. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 55 Global→Mapping→Device Support. In the Centertools download area, you will find a document which describes in greater detail the procedure for configuring DriveLock on the server side: How to use Centertools DriveLock with IGEL Thin Clients IGEL Technology GmbH IGEL Zero RFX...
  • Page 56: Remotefx Support

    Further information on Remote FX and the server-related requirements is available from Microsoft at http://technet.microsoft.com/en-us/library/dd736539%28WS.10%29.aspx. In the IGEL Registry, you can configure the number of frames sent by the server without confirmation under the key rdp.winconnect.remotefx-ack. The standard value is 1. A value of 2 or 3 can lead to improved performance in networks with high latency times.
  • Page 57: Usb Redirection

    Permits TLS-encrypted connections only / verifies server certificates / encrypted connections deletes certificates that are no longer needed Switches to prior (IGEL Linux v4.x) RDP client version - see note below! RDP Legacy Mode to solve any occurring problem with the current RDP client (IGEL Linux...
  • Page 58: Rdp Session

    However, this setting will be overridden by the Local Logon global parameter. You should therefore not use both options at the same time. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 59: Microsoft Remoteapp

     Under Keyboard, configure the keyboard layout and the hotkey properties.  Enable/disable the allocation of resources for the client, e.g. COM port or printer mapping. The global parameters (page 51) are the default setting. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 60: Performance And Options

    Use the SSH session to launch a remote application on the host via SSH (Secure Shell) and display it on the terminal. SSH allows secure, encrypted communication between two hosts or host and terminal via an unsecured network. X11 connections can also be routed via this secure channel. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 61: Firefox Browser

    8.5. Firefox Browser In order to allow central configuration via the IGEL UMS, the original configuration parameters for the Firefox web browser are assigned to the IGEL setup. These global settings can be changed for each browser session. 8.5.1.
  • Page 62: Flash Player

    Before you can download and install Adobe Flash Player, you need to confirm that the software is licensed - IGEL Universal Desktop Linux does not contain a license to use the Flash Player. The external link for downloading the Flash Player is up to date at the time of release of this software.
  • Page 63: Media Player

    Main window should remain in the foreground • Show operating components Playback  Specify how you would like to play back media files: Endless loop Automatically plays back a play list endlessly until you stop it. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 64: Browser Plug-In

    Auto: Automatically selects the output ALSA: Direct output via kernel driver for sound cards Select Stereo if you are working with an IGEL thin client. Audio output type Options  Specify whether you would like to disable the screen saver during audio playback.
  • Page 65: Media Player Sessions

    In order to be able to access Java web applications, you must enter the address of the necessary JNLP file. For example, this may be an IGEL UMS console which can also be run as a Java Web Start application.
  • Page 66: Vnc Viewer

    If a server address is specified for the session, the connection dialog will not appear when the session starts – the connection will be established immediately. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 67: Accessories

    Ctrl Ctrl 9.3. Change Smartcard Password Set up a session in order to change your IGEL smartcard password. Details of the setup procedure for your IGEL smartcard can be found under Security → Login → Smartcard.
  • Page 68: Application Launcher

    You can hide various items, e.g. buttons for shutting down or restarting the device, from the user. 9.8. Sound Control Use the sound control to adjust the output volume and the input level as well as the balance between the input and output. Figure 27: Sound control IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 69: System Log Viewer

    Figure 28: System logs 9.10. UMS Registration Registration of the thin client in the IGEL Universal Management Suite can also be performed locally. To do this, enter the server address (with port) and the necessary access data. Directories already on the server can be selected directly.
  • Page 70: Touchscreen Calibration

    9.12. Soft Keyboard (On-screen Keyboard) Enable the soft keyboard (on-screen keyboard) for use with a touchscreen, e.g. IGEL UD9. 9.13. Java Control Panel The Java Control Panel is an operating console which is used for various purposes.
  • Page 71: Network Diagnostics

    9.16. Network Diagnostics The IGEL Universal Desktop Linux firmware features a number of tools for network analysis. These include: • Device information (page 71) • Ping (page 71) • Netstat (page 72) • Traceroute (page 72) • Look-up (page 72) 9.16.1.
  • Page 72 With Traceroute, you can trace the route to a network address. 9.16.5. Look-up Look-up tool shows various information regarding your network address. The available information types are shown in this screenshot. Figure 31: Information types for network address IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 73: System Information

    The system information provides an overview of all internal and connected thin client hardware components as well as the constituent parts of the Linux system (e.g. kernel modules). The information shown can be copied to the clipboard in order to send it to the IGEL Support department for example. Figure 32: System information...
  • Page 74: Drive Management

    Drive management shows all recognized USB drives along with their respective properties (device name, mount point etc.). Figure 33: Drive management 9.19. Firmware Update This session updates the firmware with the settings saved in System → Update → Firmware Update. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 75: Identify Monitors

    You can distribute additional firmware functions via the IGEL Universal Management Suite or import licenses locally to a thin client. To do this, an IGEL USB stick with a smartcard or a storage medium containing licenses that have already been produced for this device must be inserted.
  • Page 76: Devices

    10. Devices  Click on for an overview of your IGEL thin client device. Hardware Information 10.1. Printers Various printing systems can be used with the thin client. 10.1.1. CUPS - Common UNIX Printing System The Common UNIX Printing System (or CUPS) is the software which allows you to print from within applications, e.g.
  • Page 77 • Additional serial connections: USB adapter or Perle expansion card Data are forwarded bidirectionally at serial interfaces. This means that other serial devices such as barcode scanners or scales can be operated too. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 78 LPD network printer. • + Name of another CUPS printer: ThinPrint client forwards print jobs to the appropriate printer in the CUPS printing system. Standard Defines the selected device as the standard printer. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 79: Usb Storage Devices

    Figure 36: USB storage hotplug 10.2.2. Automount Devices Here you can define the devices which are to be mounted automatically when accessed: IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 80: Usb Access Control

    Device classes can be for example entry devices, printers or mass storage devices, while device rules relate to the manufacturer, the product or the actual device (identified via its Universally Unique Identifier UUID). IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 81: Pc/Sc Interface

    PC/SC interface on the thin client. PC/SC Devices Currently Active window shows the smartcard readers which are currently available. Optional internal readers and a variety of USB smartcard readers are also supported. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 82: Security

    11.2. Logon Options  Here you can configure the local login procedure for the thin client. You can login via the IGEL smartcard or via the Kerberos protocol, e.g. in a Windows domain. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 83: Igel Smartcard

    You can use the optional IGEL smartcard for local authentication and personalized session configuration ("Flying Doctor Scenario"). Figure 38: IGEL Smartcard The procedure when using the IGEL smartcard with the internal card reader or an external reading device (USB) is as follows: Enable the IGEL smartcard solution under Security→...
  • Page 84: Company Key

    Session configurations are stored on the card's IC (integrated circuit) and the session can be used on any IGEL thin client which reads the card. Figure 39: Smartcard personalization Company Key The IGEL smartcard solution also contains a company key. This is an additional code which is written to the card and which must match the code of the terminal used.
  • Page 85: Save Sessions

    AD/Kerberos must also be configured (page 86) for this purpose. The login can be used for single sign-on in a number of session types (ICA, RDP). Link for logging off Allows you to configure the way(s) in which the user can log off. IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 86: Ad/Kerberos Configuration

    Logout command has no effect if you have not defined a login method under Security → Login (smartcard, active directory/Kerberos or IGEL Shared Workplace). The Logout command cannot be used together with an appliance - in this case, only the...
  • Page 87 The entry can be a host name or a domain name. Domain names are indicated by a preceding dot. Host names and domain names should be entered in lower-case letters. Realm Kerberos realm name for this host or this domain IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 88: Firmware Customization

    Network commands run each time the relevant interface starts (standard eth0). The interface can be defined by using the environment variable $INTERFACE (eth0, eth1, wlan0). The commands are executed at the following times: IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 89: Custom Bootsplash

    UMS. The commands are executed at the following times: Reconfiguration Executed after effective change of Thin Client configuration (local setup, UMS) 12.3. Custom Bootsplash See the description in the chapter User Interface (page 29). IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 90: Environment Variables

    Environment variables allow you to use dynamic parameter content for a number of session types, e.g. so as not to have to enter ICA or RDP servers for every session. Within the IGEL Setup, the variables can be found under: System →...
  • Page 91: Index

    GeNUCard ............44 CUPS - Common UNIX Printing System ....76 Custom Application ..........88 Hosts ..............48 Custom Bootsplash ..........89 Custom Commands ..........88 ICA Connection Center ........67 Identify Monitors ..........75 IGEL Technology GmbH IGEL Zero RFX 5.02.100...
  • Page 92 IGEL Smartcard ........... 83 NFS Font Service ..........38 IGEL System Registry .......... 28 Important Information ......... 3 Options ........... 57, 64, 65 Input ..............34 Introduction ............7 Password ............82 PC/SC Interface ..........81 Java Control Panel ..........70 Performance ............
  • Page 93 X-Server ............. 13 System Settings ..........24 System Tools ............16 TCP/IP ..............77 Test Smartcard ............ 85 The IGEL Linux Desktop ........9 The IGEL Linux Firmware ........7 ThinPrint ............. 78 Time and Date ............ 24 Touchscreen ............35 Touchscreen Calibration ........

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