seqnet_request_check

	status.i4.v = seqnet_request_check(request_id.i4.r,
					   request_command.i4.r,
					   request_synch.i4.r,
					   request_length.u2.r,
					   request_message.g.v)

	Check for a pending SEQNET request.  If present, the request is
	delivered.  A previous call to seqnet_connection is required.
	See seqnet_an_introduction for more details.

	request_id	returned ID for this request
	request_command	returned command action on this request
			(SEQNET_EXECUTE -> execute this request
					   (first time for this ID),
			 SEQNET_UPDATE -> update status of a previously
					  made request,
			 SEQNET_ABORT -> abort action on a previously made
					 request)
	request_synch	returned expected response from application
			(TRUE -> Sequencer is waiting for a reply,
			 FALSE -> Sequencer will check for a reply later)
	request_length	returned length of this request in bytes
	request_message	returned request message
			(maximum length is SEQNET_MAX_MESS bytes)

	This function returns status values as follows:

	FALSE			no pending requests
	TRUE			a request is present
	ACNET_xxx		failed in checking for requests

	This function requires the following include files:

	seqnet_h, acnet_errors_h

	Related functions:

	seqnet_connection, seqnet_requester_info_c, seqnet_reply_update,
	seqnet_reply_message, seqnet_send_status_message, seqnet_disconnect,
	seqnet_started, seqnet_an_introduction

	C/C++ usage:

	char	request_message[SEQNET_MAX_MESS];
	unsigned short	request_length;
	int	status;
	int	request_id;
	int	request_command;
	int	request_synch;

	status = seqnet_request_check(&request_id,&request_command,
				      &request_synch,&request_length,
				      (void *) request_message);