z/OS V1R9.0 TSO/E Command Reference

SEND CommandIn order for the recipient to receive and display the message, the recipient’s profilemust include the INTERCOM operand. To change the profile, use the PROFILEcommand.By default, when you issue the SEND command with the NOW operand, themessage is displayed on the recipient’s screen if he or she is logged on andreceiving messages. If the receiver is not logged on or is not receiving, themessage is deleted and you receive a message stating why the message was notdisplayed.If you issue SEND with the LOGON operand and the recipient is logged on andreceiving, the message is also displayed. If the recipient is not logged on when yousend the message, the message is stored in the broadcast data set. (If yourinstallation uses individual user logs, SEND stores the message in the user log,truncating trailing blanks. Otherwise, SEND stores the message in the broadcastdata set and does not truncate trailing blanks.)When you issue SEND with the SAVE operand, the message is stored even if therecipient is logged on. SEND stores the message in the broadcast data set unlessyour installation uses individual user logs, in which case, the message is stored inthe recipient’s user log.Installations can use security enhancements to customize how the SEND commandworks. For example, using RACF, an installation can control which users can sendmessages to other users. If your installation uses these security features and yousend a message to a user that you are not authorized to send messages to, thesystem cancels your message and displays an informational message on yourterminal.SEND also works differently if your installation uses security labels and securitychecking. Each time you send a message, the security label you are logged on withis associated with the message. The security label is used to determine if therecipient can view the message.If you issue SEND NOW or SEND LOGON, the sender’s current security label isassociated with the message. If the recipient is logged on at a security label that isequal to or greater than the security label of the message, the message isdisplayed immediately. If SEND NOW was specified and the recipient’s securitylabel is less than the message’s security label, the message is canceled. If SENDLOGON was specified and the recipient’s security label is less than the message’ssecurity label, the message is saved in the recipient’s user log.If the message you send is to be saved (when you issue SEND SAVE or SENDLOGON and the recipient is not logged on), the message’s security label is savedalong with the message in the recipient’s user log. The recipient can viewmessages saved in the user log by issuing the LISTBC command. All messages inthe recipient’s user log that have a security label that is less than or equal to thesecurity label of the recipient are then displayed. Messages that have a securitylabel higher than the security label the recipient logged on with are not displayed.See “LISTBC command” on page 174 for more information about receivingmessages from a user log.If your installation uses security labels and security checking, messages are storedin user logs. If you try to send a message to another user who does not have auser log and the message is to be saved, the message is not sent. You get amessage explaining why the message cannot be saved.262 z/OS V1R9.0 TSO/E Command Reference