Editing Open Programming Language (section)

===Testing dialog responses===
An example:
<syntaxhighlight lang="basic">
 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
</syntaxhighlight>
In this cruel interrogative program, the Yes button is assigned the shortcut of Ctrl+y, while No has Ctrl+n, represented by %y and %n respectively. The user's input from the DIALOG is tested in the IF statement, PRINTing appropriate responses to the screen. Note that the 'GET' keyword, which gets user input without using a dialog box, is here used simply to wait for a keypress before terminating the program (otherwise it would end immediately without giving time for the user to read the text). The output from DIALOG can also be stored in a variable.

Variables specific to a procedure must be declared with the LOCAL keyword; global variables are defined with the GLOBAL keyword.