istag - returns whether a tag exists in the current open object
t expects the tag identifier that you want to test.
FUNCTION RETURN VALUE
There are two possible return values for this function:
TRUE indicates that tag t exists in the current open object.
FALSE indicates that tag t does not exist in the current open object.
The return value is undefined if no object is currently open for editing.
istag returns whether or not a tag is exists in the object currently open
for editing. If maketag has been called to create a tag, and deltag has
not been called to delete it, istag returns TRUE for it.
deltag, gentag, isobj, maketag
This routine is available only in immediate mode.
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