csh levels

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Let's assume a csh invoked from a csh. How do keep track of how far down
the track, one is? Let's say one has recursively invoked csh, it should be
possible to discover how far down one is. How does one do it?
Thanx

Raminder $ingh                              Phone : +64 63 69 099 X 7772
Computer Centre MASSEY UNIVERSITY           Fax   : +64 63 505 607
Palmerston North NEWZEALAND                 E-mail: R.Singh at massey.ac.nz