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[Dustin Hewlett <sesshomaru AT prd.comcastbiz.net>]

In theory, correct me if I am wrong but each command is run in a subshell, so 
yes, it is another shell.  Also rxvt is a console emulator that executes 
/bin/sh.  Also on the note of alt-F2 shells, you can add more by inserting 
lines into the /etc/inittab.  Copy one of the lines and add one to the tty #, 
I have done this to expand the capability of my system as well as run a 
console over serial.