Press Ctrl and Alt (on Windows) and ⌘ Option (on macOS).

⌘ +N  New panel
 ⌘ +D    Duplicate panel
⌘ + Alt  Change to the following preview mode
⌘ +K   Preferences 
Alt + TChange the texture image of the selected panel
⌘ + Alt + CCancel the creation of the panels (macOS only)
Esc         Cancel the creation of the panels (macOS & Windows)
Del / SupDelete the selected panel
A    Direct selection tool
Selection tool
RRotation tool
S  Scale tool
I       Measure tool
Alt+‘Sup’    Remove link