>Is there anybody experiencing problems with old DOS programs running on VPN?
>We have an VPN connecting two local networks through two radio modems connected to two computers running NT4.The networks are visible but programs in DOS are not working...
>If you had this problem I'd really appreciate any help....

VPN is a transport mechanism; it doesn't offer a remote control capability to allow execution of an app on the other end. You need some sort of application server (PC Anywhere, Terminal Server) running on the computer you want to run the program on, and client software (PC Anywhere, terminal server client) to pass display content, keystrokes and mouse events to the application server.