RealVNC only gives free version to personal usage of their server software while it limits the functions. Could you suggest some good free VNC server software with full functions?
TightVNC is an open-source software for VNC with servers and clients.
You can download the server software for Windows from TightVNC download page: http://www.tightvnc.com/download.php
The software is GPL licensed and it is free. It also provides a commercial license if you would like to integrate TightVNC with closed-source products.