When a login occurs, a line is written to the [login] table.

This is not quite the full picture though, because not all logins are equal:

• in newer versions, the 'system' user is utilised for service accounts (i.e. the Robot, WebUI),
  and this user does not cause a login to be registered (individual Web users *are* logged though)
• in older systems (set up back when the system user wasn't available) the Robot and WebUI identities would have been allocated to a real Person, and will have left a row in [Login] at each start. As this user may have any ID or UniqueID, we can't easily exclude them in an off-the-shelf query - you need to review the results, check the name and modify the query used. Normally it will be called something like 'Pentana Robot' or have some other obviously non-human reference

There are numerous questions you can ask of the [login] table, but the most common queries are shown in the attached script:

• list all logins in the last two weeks (most recent first)
• list all unique logins in the last 365 days
• show login history for a given person (most recent first)