Check out this application that allows any users on a LAN or the Internet to communicate through voice.
Voice Chat Using Client/Server Architecture
Published 07/29/2003
Check out this application that allows any users on a LAN or the Internet to communicate through voice.
Review the code for Voice Conference, an application that allows users on the LAN/Internet to discuss in groups through voice.

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Become proficient with using type definitions in C#.

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Application Programming Interfaces (APIs) are where you have to be. It's not a matter of if as much as a matter of which.