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" Oops. In that picture, the original caller is a small rectangle, not oval, labeled &amp;quot;Main program&amp;quot;. Personally, I would have labeled it &amp;quot;Calling function&amp;quot;. And of course the thing labeled &amp;quot;Library function&amp;quot; doesn't really have to be in a software library. All three functions can be in the same &amp;quot;program&amp;quot;, and all can be in the same source member. The concept still applies. The central concept is that a function can be passed as a parameter. The passed function is the callback function. (So yeah, in my opinio..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://archive.midrange.com/midrange-l/201210/msg00644.html>