I don't use the older style log on, so I can't be positive, but the new Welcome Screen causes an event 538 when the computer is "locked" using the Win key and L.
Also, when you *unlock* a workstation, you'll see Event ID 528 "Successful
logon" with type 7
fyi...
Type 2: Interactive logon (someone at console)
Type 3: Network logon -
Type 4: Batch logon
Type 5: Service logon
Type 6: Proxy logon
Type 7: Unlock Workstation
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