Download details: RTC Client SDK 1.3

Download details: RTC Client SDK 1.3

"Windows Real-Time Communications Client API SDK 1.3

The Microsoft Windows Real-Time Communications Software Development Kit (SDK) version 1.3 provides the ability to create applications that integrate audio, video, data collaboration, instant messaging, and presence using the standard Session Initiation Protocol (SIP)."

Something new to play with...

The RTC API now (as of v1.2) supports Win2K SP4 and has limited VB6 info (1 simple sample).