| 摘要 |
<p>A point of sale system includes a master terminal (24), a backup terminal (26), a plurality of satellite terminals (30), a master file device (12) and a backup file device (18). The master file device (12) includes a master file (14) and associated file controller (14) and the backup file device (18) includes a backup file (22) and associated file controller (20). The master file (16) responds to a request for price look up from any of the satellite terminals (30) regardless of any operation of the master terminal or the backup terminal. The master file (16) or the backup file (22) acts or operates as the main operating file to update the system when the other file (16, 22) is down.</p> |
