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Rimmsy

Shareware games by their very nature are just one level versions of the full game that can be run as many times as you want on as many computers are you want. I think you must be thinking of something similar...

If you really wanted to do what you said you could just randomly generate a number and save it to a file.

; running the game
if filesize("number.key")=0
   ; this is the first time the game has been run
   f=writefile("number.key")
   writeint f,rand(9999999999)
   closefile f
else
   ; this is the second time the game has been run
endif