The applications are accessible by remote users with the proper access rights from their browsers. Citrix uses a TCP session when a published application is opened and intermingles different kinds of traffic in the same session. By default ICA uses TCP port 1494.
Currently, the VPN 3000 Concentrator supports these ICA clients:
Web Client (ActiveX and Netscape Plug-in)
Program Neighborhood Agent
Program Neighborhood Client
Java Client