There are interfaces for channels, which may be audio, video, application sharing, or file transfer, and for conferences, members, and calls, with specialized enumerators to access them. A table in the help file describes what each sample does, to help you locate an implementation of the interfaces you need. It can aid in any discussion process and has some capabilities that make it a good tool to facilitate remote development. But, at this point, I think it complements a phone call much better than it replaces one. It has a good intranet conferencing system.
Application sharing has a lot of potential.
Its web page integration is simple. It has firewall problems. It doesn't support Visual Basic.