Citrix is supported as a way to run multiple sessions of Map and some other AutoCAD verticals from a single system. WIth other options you'll run into limitations very quickly (and violoate the licensing agreement). Even for Citrix, you'll need a Citrix specific network license. www.citrixandautodesk.com has some useful pointers.
Nate Moore, GISP
Geospatial Premium Support Specialist