This function displays msg, which should be a message inviting the player to choose a suitable object for action in role (DirectObject or IndirecObject). The action will then be performed using the selected object in role.

Ask for a missing object to fulfil role in action. First see if there's a uniquely best match to fill the role, and if so execute the action with that object. Otherwise ask the player to supply an object.

Execute a fully-constructed nested action.

'isReplacement' indicates whether the action is a full replacement or an ordinary nested action. If it's a replacement, then we use the game time taken by the replacement, and set the enclosing action (i.e., the current gAction) to take zero time. If it's an ordinary nested action, then we consider the nested action to take zero time, using the current action's time as the overall command time.

'isRemapping' indicates whether or not this is a remapped action. If we're remapping from one action to another, this will be true; for any other kind of nested or replacement action, this should be nil.

Run a nested action for the current actor.

Run a nested action; execution of the parent action continues once the nested action is complete.

Note the objects in objlist as potential pronoun antecedents

Run a replacement action.

Run a replacement action for another actor.

Try action as an implicit action with [objs] as its objects

Have an actor other than the current gActor try an implicit action (e.g. if an npc moving as the result of an AgendaItem needs to implicitly open a door to proceed): actor is the actor performing the action, action is the action object to be performs, [objs] is the list of objects (if any) on which the action is to be performed.