Quick and dirty method for 9 users:
Create a batch file ‘Login.bat’ and drop it into their Start-Menu\Startup folder
@echo off
echo LOGIN %USERNAME% FROM %COMPUTERNAME% at %time% %date% >> \\SERVER\SharedFolder\audit.log
You might well be able to do this remotely, if you have the admin login for their PC just navigate to \\computername\C$ and pop in the admin password, drop the batch file into: C:\Users\<username>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup (that’s my Win7, but this path can vary)
If you have Group Policy you can run this automatically on login & logout. Otherwise you can use the ‘Security’ log on the server, but I find this can be a bit hit & miss as services create login events, not just actual users.