help

HELP  -  get online help

Usage:  HELP [command or topic]
   or:  HELP SET [variable]
   or:  HELP [TOP-LEVEL-MODE or SEND-MODE] [command or topic]

Typing HELP will show you help about a command, topic or variable.

The help screens for commands look like this one.  The first line has the
  name of the command and a short definition of what it does.  Under that, a 
  line starting "Usage" shows what else may be specified with the command;
  anything in square brackets [] is optional.

Examples:
    Read>help		           #general help
    Read>help headers	           #help about the command HEADERS
    Read>help addressing           #help about the topic of addressing
    Read>help set append-signature #help about the variable APPEND-SIGNATURE
    Read>help send-mode erase      #help about the Send Mode command ERASE
    Read>help ?                    #what help is available
  
Note that HELP at the Read> prompt is for commands you could use at the Read>
  prompt.  HELP in Top Level Mode (MM> prompt) and Send Mode (Send> prompt)
  is different.  

Another form of help is provided by the question mark:

Examples:
    Read>?                    #what commands are available
    Read>re?                  #what commands are available starting "re"
    Read>reply ?              #what further can be typed after "reply"

Note that "help ?" is a version of the last use of "?".  It shows what you
  can type after the command HELP--that is, what help can you get.