Citrix MetaFrame Application for Windows 1.8 Administrator's Manual page 59

Use the following procedure to add Network ICA connections; for example, if you
install an additional protocol such as IPX.
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To create a network ICA connection
1. Run Citrix Connection Configuration.
2. On the Connection menu, click New. The New Connection dialog box
appears:
3. Enter a name for this connection in the Name box.
4. In the Type list, click Citrix ICA 3.0.
5. In the Transport list, click the transport protocol.
6. If desired, enter a comment in the Comment box.
7. Click OK.
Asynchronous connection types allow direct dial-in to the MetaFrame server
without the overhead of RAS and TCP/IP.
Citrix recommends using high-speed serial port hardware or intelligent multi-port
adapters for asynchronous connections. High-speed serial ports and intelligent
serial adapters are less CPU intensive, freeing CPU resources that can be devoted
to running user sessions.