>I have a procedure in a .PRG file. That is, there is no FUNCTION or PROCEDURE declaration in this .PRG file. The procedure receives two parameters. I tried, for a test, to pass just a second parameter:
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>do MyProcInPrg with , lSecondParam
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>Inside the MyProcInPrg the PCOUNT() returns 2. Is this a "kosher" way to skip the first parameter and just pass the second one?

The first parameter is passed in anyway as logical false (.F.) but yes, it's good way to pass only second parameter, assuming that the first one never can be false(.F.).