(19)

(11)

EP 0 314 740 A1

(12)

(43) Date of publication: 10.05.1989 Bulletin 1989/19 (21) Application number: 88904340.0 (22) Date of filing: 27.04.1988

(51) International Patent Classification (IPC):  G06F 12/ 10( . ) (86) International application number: PCT/US1988/001388 (87) International publication number: WO 1988/009014 (17.11.1988 Gazette 1988/25)

(84) Designated Contracting States: DE FR GB (30) Priority: 14.05.1987 US 19870050795 (71) Applicant: NCR CORPORATION Dayton, Ohio 45479 (US)	(72) Inventors: SEKEL, Joseph, Michael Cambridge, OH 43725 (US) GIRARD, Donald, James Cambridge, OH 43725 (US) (74) Representative: Robinson, Robert George  International Patent Department NCR Limited 206 Marylebone Road London NW1 6LY London NW1 6LY (GB)