process living after logout

[Kenny McDonald]

We have recently discovered that when a person logs out from our Iris running
3.3.1 at random times a process will still show up when we xeq  % ps -ef

This process will look something like:

  b30607 12294     1  0 JAN 3    ttyd3     0:01 -csh

Could anyone tell me why this process stays behind?  Or is there a way of
making it die once you exit?  (besides kill -9 or killall)  

NOTE:  Notice that I said it occurs randomly.

Mail replies directly to me at:

           @aedc-vax.af.mil:c60244 at ccfiris.aedc

Thanks.
  vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
  |      Kenneth M. McDonald * Arnold Engineering Development Center       |
  |          MS 100 * Arnold AFS, TN 37389-9998 * (615) 454-3413           |
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                                 O  O A  A O  O
                                 O  O AAAA O  O
                                 O  O A  A O  O
                                  OO  A  A  OO
                                 _______________
                                               /
  vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvRETURN ADDRESS:vvvvvvvvvvvvvvvvvvvvvvvvvvvv
  |                    @aedc-vax.af.mil:c60244 at ccfiris.aedc		   |
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^