Open Programming Language, aka Open Programming Language, is an actively used programming language created in 1984. Open Programming Language (OPL) is an embedded programming language for portable devices that run the Symbian Operating System.. Read more on Wikipedia...

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Example code from Wikipedia:

PROC test:
  dINIT "Your Challenge"
  dTEXT "","Will your answer to this question be no?"
  dBUTTONS "Yes",%y,"No",%n
  IF DIALOG=%y
     PRINT "No it wasn't!"
  ELSE
     PRINT "Yes it was!"
  ENDIF
  GET
ENDP

Last updated October 20th, 2019