isobj - returns whether an object exists
obj expects the object identifier that you want to test.
FUNCTION RETURN VALUE
There are two possible return values for this function:
TRUE indicates that object obj exists.
FALSE indicates that object obj does not exist.
isobj returns whether or not an object exists. If makeobj has been
called to create an object, and delobj has not been called to delete it,
isobj returns TRUE for it.
delobj, genobj, istag, makeobj
This routine is available only in immediate mode.
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