(19)

(11)

EP 0 941 535 A1

(12)

(43) Date of publication: 15.09.1999 Bulletin 1999/37 (21) Application number: 97945989.0 (22) Date of filing: 01.12.1997

(51) International Patent Classification (IPC):  G09F 13/ 02( . ) (86) International application number: PCT/GB1997/003299 (87) International publication number: WO 1998/024087 (04.06.1998 Gazette 1998/22)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 29.11.1996 GB 19960024872 (71) Applicant: Principle Systems Limited Witton, Birmingham B6 7DA (GB)	(72) Inventor: HOWARD, Martin Near Widney, Oxfordshire OX8 7RX (GB) (74) Representative: Shaw, Laurence  Laurence Shaw & Associates, 5th Floor Metropolitan House, 1 Hagley Road Edgbaston, Birmingham B16 8TG Edgbaston, Birmingham B16 8TG (GB)