- To find the computer name: 
Windows 7:
From login screen:
- Type Ctrl-Alt-Del 
- Click Switch User 
- Click Other User 
- 
Click How do I log on to another domain? While Logged in: 
- Open System by clicking the Start button, right-clicking Computer, and then clicking Properties. 
- Under Computer name, domain, and workgroup settings, you can find your computer name, and its full computer name if your computer is on a domain. 
Windows 8:
From Login screen:
- From the login screen, select to sign in as “Other user“.
- Select the “How do I sign in to another domain?” link.
- The local computer name is shown. In this case, the local computer name is “THECOMPUTER“.
While Logged in:
- Hover the mouse at the top right 
- Click the settings cog > PC info. 
- Under Computer name, domain, and workgroup settings, you can find your computer name, and its full computer name if your computer is on a domain. 
Windows 8.1:
From Login screen should be the same as 8 above.
While logged in:
- Right click on the Start button 
- Click System. 
- Under Computer name, domain, and workgroup settings, you can find your computer name, and its full computer name if your computer is on a domain. 
Windows 10:
From Login screen:
- Click Other user. 
- Click How do I sign in to another domain? 
While logged in:
- Click the Start Start menu and select Settings. 
- Click System. 
- Click About. Your PC name will appear next to PC name. 
