If you use Single Sign-on (formerly Password Manager) with Windows XP virtual desktops, you must carry out the following procedure to chain the GINA (Graphical Identification and Authentication) dynamic link libraries, otherwise users cannot log on successfully through XenDesktop. You must do this after both Single Sign-on and the Virtual Desktop Agent have been installed.
Caution: Using Registry Editor incorrectly can cause serious problems that can require you to reinstall the operating system. Citrix cannot guarantee that problems resulting from incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Make sure you back up the registry before you edit it.