.Appendix The VAX Broadcast Utility
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BROADCAST allows any user to send a one line notice to another user on the
system.  Its syntax is 
.lit

  	BROADCAST[/BOT] TTuu:"message...message...message"
  or
  	BROADCAST[/BOT] TXuu:"message...message...message"   (DMF-32)
  or
  	BROADCAST[/BOT] OPA0:"message...message...message"
  or
  	BROADCAST[/BOT] Username:"message...message...message"

.end literal
If the form using the Username is specified (and it must be a proper
user's logon name), BROADCAST will send a notification message to all
terminals the user is logged on to.  Alternatively, using the form
specifying the terminal number, the message will be sent to the terminal
regardless of the user at the terminal.  BROADCAST can not work if
the user has set the terminal /NOBROADCAST.

Unless the /BOT switch is used, a message broadcast to a VT100 type
terminal will erase the top 6 lines of the display, sound the bell,
and display the message down two lines from the top.  The /BOT switch
forces the message to be displayed as if the terminal were a hard copy
terminal (ie the message appears at the bottom of the screen or at
the current text entry location).

To use BROADCAST, define the symbol
.lit

  	BROADCAST:==$SYS$SYSVPWFILES:BROADCAST

.end literal
This symbol is automatically defined by SYSLOGIN.COM when it 
executes @SYS$SYSVPWFILES:SETVPWSYM.COM during the logon process.
To work, BROADCAST must be installed with OPER, and WORLD
privilege.  Messages sent to DEC CRT terminals will erase the top 6
lines of the screen and display the notice 2 lines down from the top.

BROADCAST is useful in communicating messages from a batch procedure
to an interactive process.  If the batch procedure is passed the user's
name or terminal ID when it is started up, at some later time it can
notify that user or terminal of it's current status.