Suppose you're at a [MacOS] desktop and you need a [VNC] viewer (but 
eventually this parenthetical comment will say something constructive
about Remote Access for [Windows]); this happens reasonably often.
While there are several fine VNC clients for MacOS, my experience is 
their installation is a bit "fiddly".  In particular, most (?) (now?) depend on [X].
For instantantaneous gratification--''if'' you already have a [wish] installed,
such as [TclTkAquaBI]--all you need are [tkvnc]'s two source files.  Fantastic!

23sep04 [jcw] - With [TclTkAquaBI], you can also do:
    /Library/Tcl/demos/Tclkit/sdx.kit update tkvnc.kit
Then double-click on the "tkvnc.kit" file you just fetched and you're off.

All you need is a tclkit and sdx, any platform.
It all hinges on the fact that sdx is able to fetch and update starkits from the [sdarchive] repository, which contains quite a few apps & tools.