A quick check of the manual does not show the square brackets "[ ]" typically used to denote optional parameters; perhaps one might use the same variable on all buttons however- presuming it is initialized to zero before each use.

Code:
If Button = pressed then
  pause 100 'debounce
  HOLDINGBUTTON: If Button = Pressed then  'still depressed
    pause 100 'wait for release of button
    Goto HOLDINGBUTTON
  Elseif Button = NotPressed
    Do something
  EndIf
Endif