questions about vnc and audio and video

[Me ......]

Hi there....i have a couple of questions: firstly, what technical reasons 
are behind VNC not supporting audio (sound)?...and the second is does VNC 
support video?....because while im testing vnc on two windows machines and i 
played video on the server in a webcam and on the viewer i could see the 
video clearly so what are the problems VNC face with Video?....thaaaaaanks 
for any1s help.

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