What is difference between hotkey, shortcut and accelerator key?

Question

1. What is the difference about them?

2. In Qt, if I have a hotkey for QPushButton, I can make it by \"Alt + ?\", but if it\'s for qaction, I can press \"?\"

Answer 1

In Windows:

HotKey

Keyboard key or combination of keys that execute a command in a given context.

Shortcut

Multi-key HotKey with no menu navigation restrictions nor gui elements required.

AccessKey

Single key HotKey which command is to activate a visible command control (requires gui element) that is captioned/labeled with the corresponding hotkey letter underscored.

Accelerator Keys

Multi-key HotKey which command is to activate a command control (requires gui element) regardless of its visibility.