When using Dynamics GP on a Citrix-based client, there multiple users log into GP using the same GP client, and GP saves the last logged in user in the DEX.INI as Leslie stated.
In case you need the username "blank" , then you can mark the DEX.INI as read only for all domain users, while full control for server admin to enable new installations of 3rd parties and GP service-packs updates that need to write to that file.
A better solution is:
1- Copy the Dex.INI to each user folder, and to DEFAULT or PUBLIC folder as well
...\Documents and settings\username (for 32bit systems)
...\users\username (64Bit Systems)
2- change your GP application command in Citrix to the following:
C:\Dynamics\GP\Dynamics.exe Dynamics.set c:\Users\%USERNAME%\dex.ini (for 64B Systems)
this will always read the DEX.INI from each user profile, and will always default the same username for the log in user.
Thanks
Ossama Emira, CISA