UseAction

Uses an action.

Signature:

Arguments:

• slot - An action bar slot (number, actionID)
  
• target - A unit to be used as target for the action (string, unitID)
  
• button - Mouse button used to activate the action (string)
  Button4 - Fourth mouse button
  • Button5 - Fifth mouse button
  • LeftButton - Left mouse button (also used when the action is activated via keyboard)
  • MiddleButton - Third mouse button (typically middle button / scroll wheel)
  • RightButton - Right mouse button

This function is protected and can only be called by the Blizzard user interface