In the chain of events of an app updating itself, I'd like the final batch file to delete itself and close the command window it is running in. Thus far, I seem to be able to do one or the other, ...

A handful of scripts can eliminate a lot of work.

I've inheritied a messy login script situation. There are huge chains of .cmd files that call other cmd files, which call other cmd files, which call tcl scripts, which call yet more cmd ...