Hello Andres,

...
> What I am looking for is some gosub..return (or procedure
> call; for the moment, value return is not necessary, but it will be a
> plus) mechanism on UDCs.

UDC and command files (scripts) do not support function or procedure
calls within them; however, they can invoke other UDCs/scripts -- and,
therefore they can invoke themselves recursively.  The idea is to call
(invoke) yourself with a special parameter that controls where execution
in the script begins.  This approach, using alternate entry points, is
documented on Jazz at:
  http://jazz.external.hp.com/papers/SolSymposium_01/CIprogramming/index.htm
(watch for line wrap, and look in particular at slides 12 - 15 and at
 examples on slides 28, 38-43).

Also, there are scripts and UDCs on Jazz that utilize this concept of
"entry points" as a form of subroutine.  See:
  http://jazz.external.hp.com/src/scripts/index.html

Hope this helps,

 Jeff Vance, CSY