Macro that calls external program

[Josh <jnfo-d@grauman.com>]

Hi,

I am new to emacs and orgmode. I spent the last couple days reading most 
of the docs before diving in, but I didn't see anywhere how I could have a 
macro that instead of replacing the macro with lisp code, calls an 
external program instead.

Something like:
#+MACRO: func   call /home/josh/mybinary $1

{{{func(Text Argument)}}}

and this would be setup to call an external program and the output of the 
program would replace the macro on export.

/home/josh/mybinary "Text Argument"

Thanks!

Josh