Using :sh

I use :sh often.  Sometimes I forget that I did so thinking I am in a regular shell.

Is it possible to tweak the invoked shell?  I would like to change 'something' as a visual indicator.  :sh does seem to create a new shell, tcsh for me.

-d

--   David Ohlemacher  Principle Software Engineer  Scientific Solutions Inc.   99 Perimeter Rd Nashua New Hampshire 03063  603-880-3784    . o .  . . o  o o o