Chat room application - like the one in rentacoder

I need a one to one chat application that allows me to integrate chat functionality into JDEContractor.com. An appliant for a job and a recuriter can dirctly chat between each other. Invite and accept functionality. Also links by email to allow invitation and to schedule time date and topics. A bit like a chat "telephone conference" ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Windows 2000 Sql Server Asp