If you need to install the Novell client on your XenDesktop virtual machines, I suggest you read the following:
After installing the Virtual Desktop Agent, the GINA defaults back to the Microsoft GINA (msgina.dll). If you want to change the GINA back to the Novell client you can by changing the following in the registry.
Browse to HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon and change the CTXGinaDLL (REG_SZ) value to nwgina.dll and reboot the virtual machine.
Once rebooted, the Novell GINA will be seen. The author mentions that this configuration is not supported but I have not experienced any problems to date.
More information can be found here: