If you're writing an app to help with the copy, you can do a little validation since all the local drives should have a $ after the letter when viewed from Citrix.

When I had to copy files the app was hardcoded to put files on M: since all users had their "my documents" folder mapped to m. And I verified that the source of the copy was C$ or D$.

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>>It's the other way around: in a Citrix session, you're looking at the server. The c: drive you see there is actually a mapped directory given to you by Citrix, i.e. there's one such directory per user. Now your Citrix client may (or may not, depending on security settings) map your local drives - which are actually remote drives for the duration of the session. Literally, you're sitting on the server, and whatever you see there is from the server's POV - and if you see yourself (your drives, that is), it's from afar. You'll notice that by the speed of copying.
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>Now I understand. Thank you for your explanation.