How to Find out Who Is Logged in to My Machineby John RuizUpdated September 28, 2017
Windows allows multiple users to be logged in to the computer at the same time for quick switching among accounts. However, it is not immediately obvious if there are one or more users that are still logged in. Depending on the number of background applications currently running in one or more accounts and specifications of your hardware, your computer may feel unusually slow even if you already closed various apps within your active user account. You should find out first if other users are logged in to your machine before figuring out other ways to optimize your computer.
Right-click the Start button to bring up a popup menu.
Click "Task Manager" to open the Task Manager application.
Go to the "Users" tab to see what users are currently logged in.
You can also discover which users are logged in by going to the Start screen and clicking your account picture. Double-clicking a user account in the Task Manager also reveals what background programs are active within that account.
Information in this article applies to Windows 8.1. It may vary slightly or significantly with other versions or products.