What is Ctrl + Alt + 1 - 9 keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. Windows Terminal 1.7 - Switch to tab 0 - 9  
2. NoMachine - (press monitor ID) Change current monitor  
3. Deepin Linux - New theme terminal  
4. QTranslate 6.7.3 - Show selected dictionary selected 1..9th translation service  
5. SplashTop 3.2.6 - Switch to a specific monitor  

All programs

All programs using this shortcut, by category.

Note: This page includes variations for Ctrl + Alt + numrow
Alt + Ctrl + numrow
Ctrl + Alt + numrow. Restrict to only Ctrl + Alt + numrow.