>>Question: what is the "highest calling program:???

>IMHO, RETURN TO has little value in OO systems, since there is not so clear of a calling stack as there is of a messaging system. In the procedural style of programming it was not uncommon to have a maij routine that would be called and that routine would call various sub routines (which in trun may call their own subs). In this structure it could be usefull to return to some previous point in the calling stack other than the immediate previous layer.
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I couldn't see it being very useful in an event driven paradigm either... that's why I had difficulty in understanding its use and usefulness -- which leads to the inner fear that maybe there is something I'm missing, a rosetta stone, or something. Thanks Jim!