>Can anybody give me a high level overview of how a VFP app is installed on Citrix server? Also, once it is installed, do users have to login into the Citrix server when need to use the application? TIA.

Install on the server as if on a workstation, runtimes and all. The app is then launched through a link on a Citrix-served page. To create such a link you need the server tools from Citrix, which may or may not be your job - depends on how the responsibilities are divided between you and the client's IT.

The last time I did this was eight years ago, but I don't think Citrix has made it much more complicated than then. You need an icon file and the location of your executable, and then the rest is security - who, when, under which conditions has to run the app. It's also possible that the users are allowed to run desktop, in which case your app is just another .lnk file on it, and from that point on it's just a virtual workstation.

Things to consider:
- your tmp folder may vary. Citrix will create one for you; it may keep it for a while after your session is disconnected. On next login you may or may not use the same folder. Whatever is on your temp folder is neither guaranteed to survive nor to vanish.
- your client's access to her local hardware is a matter of protocol. The local printers may be visible, local disks most probably not, and any local cameras, scanners, sound devices, coffee machines, shares on local network, faxes etc etc are a matter of chance. Sometimes you may get them to work, most often not, and "works sometimes for some users" is the expected average. Have too much hair on your head? Promise them their peripherals will work.