Writing usertags

See usertag and ITL glossary entries and the UserTag configuration directive for technical information.

If you use addAttr option, then name the hash-receiving variable "$opt":

UserTag test Order one two three
UserTag test addAttr
UserTag test Routine <<EOR
sub {
	my ($one, $two, $three, $opt) = @_;

	....
}
EOR

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