HP Vectra Technical Reference Manual page 65

Input System
Block
Diagram
Application
I
Touch
Screen
Interface
(V_LTOUCH)
I
Application Interface Level
Hardware Interface Level
Pointer
(Simple Mouse)
Interface
(V_LPOINTER)
Hardware
Interface
Drivers
I
Tablet
Interface
(V_LTABLET)
I
Physical Input Devices
Figure 4.1
The tablet, pointer, and touch screen application program interface drivers are grouped together
in figure 4.1 as they are all Graphic Input Device (GID) drivers. GID drivers accept relative graphic
motion data, absolute graphics data, and button scancode data from the input devices. Data
from these devices is represented in a consistent manner throughout the Input System, making
programmatic access to different Graphic Input Devices a simple task (see the Application Event
Driver Example later in this section).
56 Input System and HP-HIL