send SOCKET,MSG,FLAGS,TO
    send SOCKET,MSG,FLAGS
            Sends a message on a socket. Attempts to send the scalar MSG to
            the SOCKET filehandle. Takes the same flags as the system call
            of the same name. On unconnected sockets, you must specify a
            destination to *send to*, in which case it does a sendto(2)
            syscall. Returns the number of characters sent, or the undefined
            value on error. The sendmsg(2) syscall is currently
            unimplemented. See "UDP: Message Passing" in perlipc for
            examples.

            Note the *characters*: depending on the status of the socket,
            either (8-bit) bytes or characters are sent. By default all
            sockets operate on bytes, but for example if the socket has been
            changed using binmode() to operate with the ":encoding(utf8)"
            I/O layer (see "open", or the "open" pragma, open), the I/O will
            operate on UTF-8 encoded Unicode characters, not bytes.
            Similarly for the ":encoding" pragma: in that case pretty much
            any characters can be sent.