Halcyon-X12, have you even tried Ultr@VNC next to RDP? There is hands-down no comparison.
For starters, RDP is not merely "remote control" so you're not even comparing equivalent functionality. It provides true multi-user access. With all flavors of VNC, you get one session: the console. That's it. With RDP, I can remote control the console or I can have as many concurrent non-console sessions (independent logons) as the server has CPU and RAM to support.
Secondly, in the vast majority of configurations, the performance of RDP is so vastly superior to any of the "optimized" VNC flavors that it's immediately obvious to anyone who tries them using limited bandwidth.
All those other features, from file transfer to Ctrl+Alt+Del, are built into Microsoft's RDP Client, too. They just aren't crammed onto an in-your-face toolbar. For example, Ctrl+Alt+End sends Ctrl+Alt+Del, and this is documented in the online help file. Where's the online help? Just click on the icon in the upper left of the window (come out of full-screen mode first) and choose Help > Remote Desktop Connection Help. In the Contents, double-click "Using Remote Desktop Connection" then expand "Use Remote Desktop Connection" and select "Using Terminal Server shortcut keys."
Another thing that people always assume they can't do in RDP, just because there's not an obvious menu or toolbar for it, is connecting to the local console. With RDP 5.2, all you have to do is add /console after the computer name before connecting. Also documented.
The only things supported by Ultr@VNC but not by RDP are: compatibility with other VNC clients (duh) and 32-bit color depth. Even at LAN speeds, I can't imagine a situation where you would want to remotely access more than 24-bit color.
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