Instant Messaging (chat) in enterprise, with local networks (LAN) or Internet for effective intra-office communication. Server is PHP or MySQL (opensource), make easy for the administrator to choice all options, for display, contact manage, and lock. Can force nickname to Windows username or let users choice by themselves. Can force user to use password, limit (or not) maximum simultaneous users, online users, and contacts numbers. Can be public or locked by password.