Workstations can be scanned automatically at login, scans can be initiated from the Manager application, or can be forced from a command line at the workstation. Workstations Information Files (WIFs) are collected on the server which contain all the component data about your workstation. Once the WIF is built, the client on your workstation sends that file to a collection server, which interprets it and passes it to a database (MS SQL2000). The first time a workstation is scanned the WIF is about 200-300k, and subsequent scans are about 20-30k.
You can set up collection schedules to scan workstations at whatever frequency you like.