Patent ID: 6999960

Claim:
A data storage and retrieval system comprising a local operator input station, wherein said local operator input station comprises an information input device and an information display device, and a computer useable medium having computer readable program code disposed therein to coordinate requests submitted to said data storage and retrieval system, the computer readable program code comprising a series of computer readable program steps to effect: receiving an initialization request at a first time from said local operator input stations, wherein said initialization request comprises a requested operation, wherein said requested operation is selected from the group consisting of importing and/or exporting one or more physical/logical volumes into or out of the system, changing the category assigned to one or more physical logical volumes, modifying access authorization for one or more physical/logical volumes, and obtaining a stacked volume map; providing to said local operator input station a current history comprising previous commands received by said data storage and retrieval system to perform said requested operation; generating at said first time a request history token; receiving at a second time a command to perform said requested operation; generating at said second time a current history token; and operative if said request history token matches said current history token, performing said requested operation.