Suppose you're at a [MacOS] desktop and you need a [VNC] viewer (but 
eventually this parenthetical comment will say something constructive
about Remove 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!