suppose you want to compare more than one key at the same time and for this purpose, when you open regedit while regdit is open, it will not normally open, if you want to open the second one while regedit is open: Press the windows + R keys and give the following command:

regedit /m

Reloading the Registry database

After installing programs, they often require a Windows restart so the changes can take effect. However, in most cases, there is a situation where only the Registry needs to be reinstalled. For this, the computer does not have to be reinstalled. Click the desktop with the right mouse button and click the NewShortcut icons. Now enter these command lines.

C:Windowssystem32Rundll32.exe Shell32,sheexitWindowsex

Click the Next button, name the shortcut and click Next again. Double-clicking the shortcut will reload the Registry database without the need for a cumbersome reboot

see also