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As a follow-up:

I understand that CALL will send a char(32), so if my prototype expects a char(32) (or shorter) and I send a parm that is 7 characters long, then the trim works as expected because my program's receiving a char(32), comprised of my 7 char string and 25 blanks at the end.

If ...

Ah, thank you both--that makes sense. I appreciate the education!

I have a program with a Main prototype (and matching pi) containing two char parameters. In my program, I'm ascertaining the "actual" lengths of the input parameters using %len and %trim, like so:

%len(%trim(var1));

I'm testing this by calling it from green screen and passing it params of length 7 ...