There's some explanation in FPC docs. IIRC pp stands for "pascal plus"
and is the old extension of FPC programs. I think it's more of a
preference over "rule" since if you look at sources of lazarus or fpc
itself you'll noticed different names for different thing.
I think one "rule" is that if you use fpc or objfpc mode you should name
it .pp while delphi/tp mode should be .pas. I don't follow this rule tho.
Ales
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