Press Ctrl and Alt (on PC) and ⌘ and Option (on Mac)                                                                            
⌘ +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 (Mac only). 
Esc         Cancel the creation of the panels (Mac & Win).
Del / SupDelete the selected panel.  
A    Direct selection tool.   
Selection tool.  
RRotation tool.
S  Scale tool. 
I       Measure tool. 
Alt+‘Sup’    Remove link