Function:     IRSERVER_SCAN

Purpose:      Accesses IRAS server data of the specified type for the specified
	      scan(s)

Category:     IRAS, SYSTEM

File:	      irserver.c

Author:       A.R.W. de Jonge

Use:	INTEGER IRSERVER_SCAN (
		SOP,			Input	integer(*)
		ATT,			Input	integer(*)
		COUNT,			Input	integer
		INSTRUMENT )		Input	character*(*)

	IRSERVER_SCAN
		A non-negative number indicates that the
		call was successfull. This number is equivalent
		to the MTID returned by a succesfull call to
		MTOPEN, see MTOPEN.DC2. It must be used in
		successive calls to the fits or mtio routines.
		A negative number denotes one of
		the following errors:
			-1	Illegal INSTRUMENT
			-2	Cannot allocate and use disk space
	SOP
		Array with SOP numbers of requested scans.
	ATT
		Array with ATT numbers of requested scans.
	COUNT
		Number of scans requested. For each scan I, the
		array elements SOP(I) and ATT(I) uniquely identify
		a scan. The data set for that scan, as identified further
		by INSTRUMENT, are put into the dataset.
	INSTRUMENT
		One of the possible instrument names for IRAS data,
		as described in IRCC_INSTRNAME.DC2,
		eg. 'AO b1', 'survey b2', etc.


	A call to IRSERVER_OPEN replaces an MTOPEN when accessing IRAS
	data on an IRAS data server.
	The resulting MTID identifies a disk-space containing
	(references to or copies of) the requested IRAS data,
	in a read-only form compatible with the MTIODEV interface.

	The user should call IRSERVER_CLOSE to destroy the scratch disk space
	claimed by these utilities.

	Related Docs:	irserver.dc2, irserver_close.dc2
			mtiodev.dc2, mtopen.dc2, fts_io.dc2
			ircc_const.dc2, ircc_instrname.dc2

Updates:      Jul 13, 1993: AdJ Added irserver_scan