 The most frequently used commands are single-letter:
 
 ?         Help. (Typing a '?' will give you a menu almost anywhere)
 D         Prints directory, if there is one in the current room.
 E         Enter a message.
 F         Read all messages in the room, forward.
 G         Goto next room which has UNREAD messages.
 H         Help. Same as '?'
 K         List of Known rooms.
 L         Reads the last five messages in the room.
 N         Reads all new messages in the room.
 O         Reads all old messages, backwards.
 R         Reads all messages in the room, in reverse order.
 S         Skips current room without making its messages old.
 T         Terminate (logout)
 U         Ungoto (returns to the last room you were in)
 Z         Zap (forget) room. (Removes the room from your list)
 *         Enter the subsystem.
 
 In addition, there are dot commands.  You hit the . (dot), then press the
 first letter of each word of the command.  As you hit the letters, the
 words pop onto your screen.  Exceptions: after you hit .Help or .Goto,
 the remainder of the command is a help file name or room name.
 For more help on dot commands, type .Help SUMMARY
