The door bell app virtually identical to the emergency contact app. It simply sends an alert IM to recipients in SiMPâ„¢. The only difference between the emergency app and the door bell app is that the emergency app also sends a confirmation IM to the owner of the SiB (who is presumably, not the same recipient), while the door bell app does not.

PROG S
ALERT 12345551111 Door Bell!
HALT

TO SUBMIT THIS PROGRAM:
Simply modify the above to include your own mobile number or message, and send it via IM to your SiB. Press your SiB to receive the program.