is modifying the authorized telephone number table and the access code table associated with the pid wtn the pc server responds to the request with either a success or failure indication another set of possible transactions between the pc server and pc client is establishing and releasing a user 39 s lock on a pid wtn 39 s file establishing the user 39 s lock locks the pid wtn 39 s file from write access by other users in other words a lock prevents any other user from editing the tables associated with the pid wtn when a user requests a view of a pending pid wtn file the pc server locks the pending pid wtn 39 s file preventing any other user from submitting modifications to the pid wtn 39 s file the release lock transaction may be used to unlock the pid wtn 39 s file the release lock request is sent by the user interface on the pc client when a user has exited the pid edit screen a cancel pending request transaction is also possible between the pc client and the pc server the cancel pending request transaction allows a user to cancel a pending request against the pid wtn in a preferred embodiment the user selects a specific file for canceling or a file assigned to a specific pending date after canceling a pending request on a pid wtn the user interface may allow the user to edit the pending view retrieved prior to the cancellation and resubmit the request a user must obtain a lock on the pid wtn after performing the cancel cancellation of a pending file for a.