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A datagram connection communicates with individual
packets rather than streams of data. Each call to
process-send sends one datagram packet (see Input to
Processes), and each datagram received results in one call to
the filter function.
The datagram connection doesn’t have to talk with the
same remote peer all the time. It has a remote peer
address which specifies where to send datagrams to. Each
time an incoming datagram is passed to the filter function, the
peer address is set to the address that datagram came from; that
way, if the filter function sends a datagram, it will go back to
that place. You can specify the remote peer address when you
create the datagram connection using the :remote
keyword. You can change it later on by calling
set-process-datagram-address.
If process is a datagram connection or server, this function returns its remote peer address.
If process is a datagram connection or server, this function sets its remote peer address to address.