[fowlplay4]

This is the gist of storing a 'key' as a flag instead of using a weapon.

Key NPC:

PHP Code:

function onPlayerTouchsMe() {
  clientr.key = true; // This can be found in the script flags tab of your attributes
} 


Door NPC:

PHP Code:

function onPlayerTouchsMe() {
  if (clientr.key) {
    hide();
    sleep(3);
    show();
  }
} 


Also 1 is the same as true in GS2.

Documentation:
clientr variable explanation
Logic and conditional statements