PDesk.exe
(Matrox)
System Tray icon for the Matrox PowerDesk software which comes with their graphics cards (VGA cards).
Recommendation :
If you play games a lot then you will probably want to keep this icon in the System Tray in order to be able to access quickly some of the many advanced graphics features of the PowerDesk software. If you experience problems with PDESK, ensure you have the latest versions of the PowerDesk software. If you are not a gamer, then disable PDESK with Startup Manager.