Citrix and VB Programming

In our office we have a client that uses a Citrix system. We load the web site, then it launches the application approriately. Some time ago somebody in our company write a VB program that pastes the account number from our dialer session into the Citrix screen where the account number belongs, but now nobody knows where that source is and/or how to do it again. Has anyone done this out there that can shed some light as to how to do that?