>Me again :)
>
>I have confirmed from the Citrix engineer that (as Dragan correctly wrote) each user of my application will have a separate memory space (hence each user will have a user ID and password). And I wrote to the Citrix engineer that my app needs a minimum of 2 GB of RAM (just a guess on my part :)).
>But now I am thinking. If 20 users log into the Citrix server to use my app and each is allocated 2 GB or RAM, would they (Citrix engineers) need to have the server with a minimum of 40 GB of RAM?

If not, it will employ some swapping scheme - it needs at least "logical" 40GB RAM if you set it up that way.
I URGE you to test those settings with benchmarks on the actual HW/OS/VM combination, as my tsts of 10 years ago showed markedly different speed advantages depending on the VM software used (VirtualBox and the MS offereing of that time) and the way to open up the disk path to shared data tables. In some configurations VMs with 384 MB were fastest, in others 768 - 1024 MB, as the unused RAM was used as a disc cache for the host system running all VMs.

Vfp can run with minimal RAM as long as you do not need multi-tbale GB SQL joins, as hose temp tables and Rushmore bitmaps are best when fully in RAM. 2GB will probably mean a lot of VM-specific disc cache, which can be counterproductive if the same physical vfp table is shared in multiuser mode across VMs - might be a lookup table, where access that way is faster. Does not/less matter if all shared data is in SQL server. Think in advance, test and perhaps tweak your SW ;-)