The Station Status tool in WinSPC's Administrator window can be found under 'Tools' -->'Station Status'. It serves 2 purposes:
1) To list every station and corresponding station name that has ever logged into WinSPC. 2) Show the version of WinSPC each stations most recently used.
WinSPC requires that each station is on the same version of WinSPC on a given WinSPC database. Therefore the Station Status window can serve as a way to keep track of which stations have logged in at any time since an upgrade.
You can use the Station Status as a way of tracking stations that may have been decomissioned or taken offline within your organization.
NOTE: If you are using Terminal Services in User Mode, you might also be able to track who has logged in after an upgrade, as in this configration WinSPC will use a user's Windows credentials as the station.