Identifying the caller

[graham samuel]

Folks, I really should know this by now, but when a handler is called, 
can its script identify its caller and if so how? I guess there is some 
context description available but I don't know how to find it in the 
docs. And while we're at it, what if the invocation of the handler is 
the result of a "send", e.g.

send "mouseUp" to myMouseUpHandler
Can I tell from within the handler that it wasn't a true mouse click 
that invoked it, and if so how?

Obviously the engine does know this information - it's just a question 
of if and how it's made available to the developer.

TIA for any info
Graham
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Graham Samuel / The Living Fossil Co. / UK and France
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