A partial answer is:
On windows (depending on where you installed Tcl/Tk) do
`load c:/windows/system/tk80.dll Tk`
on AIX you have to extract the `shr.o` from inside the `libtk8.0.a` and
then you can load it with
`load ./shr.o Tk`
What you have to watch out for is that tclsh does not have an event loop
running so you have to provide your own. e.g.
`tkwait window .`
otherwise the shell will exit once it has evaluated the source. When
compiling on Unix, make sure that -lX11 is specified to the linker,
otherwise the Tk library might have dynamic loading troubles.