SimpleActivityLogger is a small DLL that hooks into Windows and records the following events:

* System Startup & Shutdown
* User Logon & Logoff
* Console Lock & Unlock
* Screen Saver start & stop

There is a also a small GUI application to allow the user to specify what events are logged and to where.

SimpleActivityLogger is most useful for people who need to track their computer usage during the course of a day for billing purposes, where system startup & shutdown and/or logon & logoff times are a good indication of the amount of billable time they have spent using the computer.
It is also useful for tracking the usage of a shared computer, including checking for unauthorised usage.