@OPEN <DIRECTION>[;<direction>;<direction>] [=<#number>]

Creates an exit in the specified direction(s).  If <#number> is
specified, it is automatically @LINKed to that room.  Otherwise,
the exit is created unlinked.  Anyone may use the @LINK command
to specify where the unlinked exit leads.

EXIT NAMING CONVENTIONS:
  North to the <Destination Room>;north;nor;no;n;<destination>
  (ie: North into the Closet;north;nor;no;n;closet;cl)

  East through the <type of exit>;east;ea;e;<type of exit>
  (ie: East through the Red Door;east;ea;e;red door;red;rd)

  <Verb> <target> with <object>;(Enough to make it unique);(unique abbv)
  Sit on the Chair;sit;chair;sitchair1
  The 'Unique Abbv' comes in handy when there are multiple identical actions.

see also: bogus, costs, exits, @link