Raspbian

General

(press underlined letter) Access dropdown

Alt + A - Z

All hotkeys for Raspbian

General
Run dialog

Alt + F2

General
System menu

Ctrl + Esc

General
Open program menu

Alt + Space

General
Switch between programs

Alt + ⭾ Tab

General
(press underlined letter) Access dropdown

Alt + A - Z

General
Make active window fullscreen

Alt + F11

General
Close window

Ctrl + Q

General
Back to CLI

Ctrl + Alt + ⬅ Backspace

Similar combinations for other applications

Microsoft Access 2016
Select the option, or select or clear the check box by the letter underlined in the option name
Using dialog boxes

Alt + A - Z