Hello, Vypress chat is a product by VyPRESS Rsearch: "Vypress Chat is a user-friendly application for real-time chatting in small office or home office (SOHO) local networks. This unique chat software features an easy-to-understand format for text-based conferences and discussions. Vypress Chat does not require an Internet connection or a dedicated server to support discussions, and all users have equal access to the application's tools and functions. Vypress Chat enables individuals to instantly communicate about joint projects, and managers can send instantaneous memos to individuals, departments, or the entire company." check out there web site http://www.vypress.com http://www.vypress.com/products/chat/ mainly it uses UDP Port Number 8167 and after installing ISA 2K4 it does not work i think ISA has blocked that port. Well hope you will help me "Tom" Thanks Allah Hafiz Mashahood Ahmed