►►─── SEND MESSAGE ─┬──────────┬──────────────────────────────────────────────►
                    ├─ ONLY ◄ ─┤
                    └─ ALWAYS ─┘

 ►─── TO ─┬─ DEST ID 
destination-id ─┬────────────────────────────────────────►
          ├─ USER ID 
user-id ────────┤
          └─ LTERM ID 
lterm-id ──────┘

 ►─── FROM 
message-location ─┬─ TO 
end-message-location ─┬─ . ────────────────►◄
                             └─ LENGTH 
message-length ───┘

ONLY
Sends the message immediately when the destination, user, or terminal is available, and does not queue the message for subsequent transmission when the destination, user, or terminal is not available. This value is the default. 
If ONLY is specified with the DEST ID option and some, but not all, of a group of users or terminals in the destination are available, the message is sent to the available ones. The sender is not aware of any unsuccessful transmissions.
ALWAYS
Sends the message immediately when the destination, user, or terminal is available, and queues the message for later transmission when the destination, user, or terminal is not available.
TO DEST ID 
destination-id
Specifies the destination ID of the message recipient. Specify the symbolic name of a user-defined field that contains the destination ID, or the ID itself enclosed in quotation marks. The destination must have been defined during system generation.
TO USER ID 
user-id
 
Specifies the user that receives the message.
User-id
 is the symbolic name of a 32-byte user-defined field that contains the user ID. The specified user can be signed on to any terminal.
TO LTERM ID 
lterm-id
Specifies the logical terminal that receives the message. Specify the symbolic name of a user-defined field that contains the terminal ID, or the ID itself enclosed in quotation marks.
FROM 
message-location
Specifies the WORKING-STORAGE SECTION or LINKAGE SECTION entry that contains the message text to send. Specify the symbolic name of a user-defined field.
TO 
end-message-location
Specifies the end of the WORKING-STORAGE SECTION or LINKAGE SECTION entry that contains the message text. Specify the symbolic name of a user-defined dummy byte field or a field containing a data item that is not associated with the message text.
LENGTH 
message-length
Defines the length of the message text in bytes. Specify the symbolic name of a user-defined field that contains the length, or the length itself expressed as a numeric constant.

Example 1

The following statement sends the message in the TERM-MESS field to the logical terminal KENNEDYA:

SEND MESSAGE ALWAYS
  TO LTERM ID 'KENNEDYA'
  FROM TERM-MESS TO END-TERM-MESS.

Example 2

The following statement sends the message in the TERM-MESS field to the user field:

MOVE 'KYJOE2' to USER32.
   SEND MESSAGE
    TO USER ID USER32
    FROM TERM-MESS TO END-TERM-MESS.

Example 3

The following statement sends the message in the TERM-MESS field to the destination ALL:

SEND MESSAGE
  TO DEST ID 'ALL'
  FROM TERM-MESS TO END-TERM-MESS.