Messaging system for mobile terminals where the system utilizes a message
server which exchanges messages, originating from the terminals, through
use of an identification code. The message server grants each terminal
access to the messages originating from terminals which use
identification codes that belong to the same group of identification
codes. The identification codes within each group can be identical or
non-identical, and, as for the latter, the message server arranges the
identification codes into groups. The message server "stores and
forwards" messages, and provides real-time message exchange; and keeps
track of which message originates from which terminal, which message has
been retrieved by which terminal and, on a group by group basis, which
terminals are simultaneously connected to the message server.