MSH is the acronym for the Microsoft Command Shell.
RS Wouldn't that be MCS? It's fine that they join a tradition of sh, csh, bash, zsh... but I'd pronounce this as "MS Hell" :)
AMG You remind me of "DOSSHELL", which sometimes is better spelled with only one S. :^)
This is also the initials of Martyn Smith A long time reader and short time contributer to this Wiki.