(19)

(11)

EP 0 524 945 A1

(12)

(43) Date of publication: 03.02.1993 Bulletin 1993/05 (21) Application number: 91904942.0 (22) Date of filing: 19.02.1991

(51) International Patent Classification (IPC):  G06F 3/ 06( . ) G06F 13/ 12( . ) G06F 13/ 10( . ) (86) International application number: PCT/GB1991/000254 (87) International publication number: WO 1992/015058 (03.09.1992 Gazette 1992/23)

(84) Designated Contracting States: DE FR GB (71) Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION Armonk, N.Y. 10504 (US)	(72) Inventors: JUDD, Ian David Winchester Hampshire SO21 2EG (GB) SZATKOWSKI, Michael Jan Brockenhurst Hampshire SO42 7QT (GB) (74) Representative: Killgren, Neil Arthur  IBM United Kingdom Limited Intellectual Property Department Hursley Park Winchester Hampshire SO21 2JN Winchester Hampshire SO21 2JN (GB)