CTRL + M
=> Mute your mic (audio output)CTRL + B
=> Mute your video outputSHIFT + ALT + C
=> Toggle the control bar that's normally at the bottom of the screen.CTRL + ALT + F
=> Open the file-sharing windowCTRL + ALT + C
=> Cycle the camera to the next camera availableCTRL + ALT + S
=> Open the screen-sharing windowCMD
instead of CTRL
]