status.i4.v = ntv_send(node.i2.v, task_name.i4.v,
			       message_buffer.i2a.r, message_length.i2.v)

	Send an Unsolicited Special Message (USM).

	node		destination logical trunk and node. A zero value
			implies the LOCAL node.  The trunk (also known as
			the LAN id) is stored in the upper byte of this word.

	task_name	destination network task name.  A zero value
			implies the caller's task name.

	message_buffer	buffer with the message data to be sent.

	message_length	length of the message data (in words).

	status	VMS completion condition code.

	This function returns status values as follows:

	SS__NORMAL	success, message sent or queued for transmission
	SS__INSFARG	must have 4 arguments specified
	SS__INTERLOCK	error, XMTWT bit is already set!
	SS__NONEXPR	non-existant network process
	SS__NOSUCHNODE	no such destination logical node known
	SS__SSFAIL	XSC block does not exist
	SS__VECINUSE	block/buffer pointer save vector in already use
	NET__BUGCHECK	internal network error (XMITWT event flag bug)
	NET__NOBUFFER	no free buffers to send message
	NET__NOMSG	must specify a user message of non-zero length
	NET__NOTCNCT	not connected to network.
	NET__TOOLONG	message too long

	This function requires the following include files:

	acnet_h, ssdef_h

	Related functions: