At home, I'm now using <a href="http://ctwm.dl.nu/">CTWM</a> [<a href="../twm/ctwm.jpg">screen</a>] 
[<a href="../twm/ctwmrc.txt">twmrc</a>]. Since CTWM is backwards compatible to TWM, and TWM ignores
config lines it doesn't understand, you can have a base known-good TWM config with CTWM extensions. 
So, even if you nuke your CTWM, you'll have a familiar TWM desktop.