# What counts as stdin?

Many questions specify that input must be on STDIN, but get answers in golfscript, brainfuck, mathematica, gnuplot etc.

I don't know whether these languages actually read from stdin, or can be persuaded to - and if they can't, should they be considered licit?

• On many OSs outside the Win* and **x worlds there isn't a STDIN thing. – Dr. belisarius Apr 21 '14 at 7:34