YELL

Command: YELL -- Yell for sysop
Synopsis: Y[ell]
Availability: All users.
Description: The YELL command attempts to attract the attention of the sysop by making a distinctive sound on the console and displaying a message. If the sysop is available she may then break in on your session for a one-to-one chat.
Limitations: A yell may not always be successful because (a) the sound may be disabled during unsociable hours, (b) the sysop may be away from the console or busy talking to someone else, (c) there may not even be a loudspeaker in the computer, or (d) the node may be located on a remote hilltop or in someone's garage.
See also: TALK(2) -- Talk to a user