Secure access to WinNT server

[a12]

Hello,

Pardon my ignorance but I do not find any thoroughful help on
the web.

I am considering securing access from a Windows 2K client to a
Windows NT server that runs VNC server program. For now,
everyone can access the WinNT server just by entering the VNC
access password, and then entering userid/password defined in
this server. The GUI capability of VNC is used extensively,
i.e. by executing Windows Exporer on the server.

Is it possible to further restrain access to the WinNT server,
i.e. by securing VNC with SSH ?

Any hints will be greatly appreciated.