I installed copssh on Windows Vista (64-bit) here, and the installation seemed to go fine.
It requires you to explicitly add users to log in, which is fine, so I opened the COPSSH Control Panel (really just an app), went to the Users tab, clicked Add, Forward, and the "User:" popup is empty. The "Domain:" popup has exactly one entry: my computer name.
The "Documentation" shortcut in the start menu group is broken, but I found the folder it's supposed to point to, and I only see docs for command-line tools (which I'll investigate next).
Is there something I'm missing? Is the COPSSH Control Panel just plain broken?