The login history shows login events captured by the PerformanceGuard agent on the computer in question.
To view the login history, select ANALYZE > Computers > Computer Search, and search for a computer. Then, in the search results, click the name of the required computer, and then select the Login History tab.
Each login is shown as a horizontal bar. The time (in seconds) it took the login to complete is shown on the vertical axis of the graph.
You are able to adjust:
The maximum number of logins shown on the graph,
The time interval that the graph covers
Below the graph you'll see a list of the logins that have taken the longest time to complete.