passing pointers

John--

You aroused my curiosity about passing pointers by reference.  Of course you
can't pass anything by value in a dynamic call, but I wrote two almost
identical programs that each contained a sub procedure that took a pointer
as a parm and used it as the base of a data structure identical to one in
the calling program.  In one program I defined the pointer as passed by
value and in the other I went with the default.  Both programs used updated
the data structure in the calling routine successfully whether the pointer
was passed explicitly by value, or by whatever the default for pointers is.

I guess the real question is, how are pointers passed as parameters?  It's
documented clearly somewhere and I just haven't seen it yet?  
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