* Predefined and user defined KEY event number assignments to use with ON KEY(n):
{{WhiteStart}} '''1 to 10'''.............Reserved '''F1 to F10''' function keys only.
'''11, 12, 13 and 14'''...Reserved '''Up, Left, Right and Down''' numeric keypad arrows only
'''15 to 29'''............'''user-defined keys''' using value: [[CHR$]](keyflag) + [[CHR$]]([[Keyboard scancodes|scancode]])
'''30 and 31'''...........Reserved '''F11 and F12''' function keys only.
{{WhiteEnd}}
* See the [[KEY n]] page for user defined key or key combination presses and F function softkey assignments.
* [[GOSUB]] with a {{Parameter|linelabel}} or {{Parameter|linenumber}} or a [[SUB]] procedure (without the [[CALL]] keyword) can be triggered in '''QB64'''.
{{PageExamples}}
''Example 1:'' Using ON KEY with [[GOSUB]] to execute code.
{{CodeStart}}
{{Cl|KEY(n)|KEY(1) ON}}
{{Cl|ON KEY(n)|ON KEY}}(1) {{Cl|GOSUB}} trap
{{Cl|PRINT}} "Press F1 to quit!"
{{Cl|DO}}:{{Cl|LOOP}} 'never ending loop
trap:
{{Cl|PRINT}} "You pressed F1 like I told you to :)"
{{Cl|END}}
{{Cl|RETURN}}
{{CodeEnd}}
''Example 2:'' Setting multiple ON KEY statements to send different values to a [[SUB]] procedure.
{{CodeStart}}
{{Cl|FOR...NEXT|FOR}} n = 1 {{Cl|TO}} 10
{{Cl|KEY n|KEY}} n, {{Cl|STR$}}(n) ' assigns soft key as a numerical string
{{Cl|ON KEY(n)|ON KEY}}(n) Funct n 'designate SUB procedure and parameter value passed
{{Cl|KEY(n)|KEY}}(n) ON ' turns each key event monitor on
{{Cl|NEXT}}
{{Cl|KEY n|KEY}} ON 'displays F1 to F10 soft key assignments at bottom of screen