Here is a the list of Google+ hangout window's keyboard shortcut which will useful while in hangout.You can find out both Windows and Mac operating system shortcut in this post. Google+ Hangouts, have been exciting news so far for everybody.Google+ Hangouts supports the following keyboard shortcuts. Keyboard shortcuts are also available in Hangouts -- great for people who can't or don't want to use a mouse during the hangout.
Google+ hangout keyboard shortcuts windows Operating system.
? – Shows help dialog
Ctrl + e – Enable / Disable Camera
Ctrl + d – Mute / Un-Mute Microphone
Ctrl + g – Switch as primary speaker (works when audio is muted)
Ctrl + b – Show / Hide Chat section
Ctrl + y – Set focus on Apps menu
Del – Remove or Close a Hangout app
Alt + 1 – Open your menu (Shows a menu just below your own video thumbnail with link to your Google+ profile and microphone icon)
Ctrl + e – Enable / Disable Camera
Ctrl + d – Mute / Un-Mute Microphone
Ctrl + g – Switch as primary speaker (works when audio is muted)
Ctrl + b – Show / Hide Chat section
Ctrl + y – Set focus on Apps menu
Del – Remove or Close a Hangout app
Alt + 1 – Open your menu (Shows a menu just below your own video thumbnail with link to your Google+ profile and microphone icon)
Google+ hangout keyboard shortcuts for Mac
? – Shows help dialog (Press Shift and ?)
Cmd + e – Enable / Disable Camera
Cmd + d – Mute / Un-Mute your Microphone
Cmd + g - Switch as primary speaker (works when audio is muted)
Cmd + b - Show / Hide Chat section
Cmd + y – Set focus on Apps menu
Del – Remove or close your hangout app
Opt + 1 – Open your menu
Cmd + e – Enable / Disable Camera
Cmd + d – Mute / Un-Mute your Microphone
Cmd + g - Switch as primary speaker (works when audio is muted)
Cmd + b - Show / Hide Chat section
Cmd + y – Set focus on Apps menu
Del – Remove or close your hangout app
Opt + 1 – Open your menu