How to get currently Logged in users list?

Hi All,

I am wondering how can I get the List of currently Logged in users?

Is there any way to figure it out? I was looking into tracker table but didn't get any luck so far.

Any hints or suggestions are highly appreciated.

Environment Details:
Sugar Professional Edition 6.5.14 (Build 1055)
PHP Version 5.3.10

Regards,
Sagar Salunkhe