in reply to
perltk.org has a few good articles and tutorials including Essential Perl/TK Programming. Some of them are a couple years out of date, but should provide you with a starting point.
There's also Mastering Perl/Tk if you're looking for a book.
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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