Commands should be given at the small interactive window opened along with the main window.
Prints out the player's statistics (strength & experience).
Prints out the equipment.
Prints out the missions.
(When near a different player) - give him an item. For example:
.. gives him a sword.
(When near an NPC) - completes the existing mission (if any) or gives you a new mission, if possible.
(When near an NPC) - the NPC will introduce himself.