HYPERLINK"http://msdn.microsoft.com/en-us/library/ff553747(v=VS.85).aspx"http://msdn.microsoft.com/en-us/library/ff553747(v=VS.85).aspxWindowsTouchOverview(Windows7)WindowsTouchisthenameforthetouchandmultitouchfunctionalityintheWindows7operatingsystem.InthecontextofWindowsTouch,touchreferstosupportofasinglephysicalcontactpoint,whereasmultitouchreferstosupportfortwoormoreconcurrentphysicalcontacts.ChoosingtoProvideaDriverInWindows7,vendorswhosupportWindowsTouchmightberequiredtoprovideadriver.IfyourdigitizerdevicesupportsHIDinfirmware,youarenotrequiredtoprovideadriver.IfyourdevicedoesnotsupportHIDinfirmware,youmustincludeadriverthatsimulatesHIDsupport.WerecommendthattouchdevicesbeUSBHIDdevices,andthatvendorsdonotsupplyadriver.Inthisscenario,thereportdescriptorandrelatedinformationisprovidedinfirmware.Whetheryouprovideadriverornot,youmustsupportselectivesuspendinyourINFfile.Formoreinformationabouthowtosupportselectivesuspend,seeHYPERLINK"http://msdn.microsoft.com/en-us/library/ff538662(v=VS.85).aspx"EnablingUSBSelectiveSuspendforHIDDevices.Avendor-supplieddrivershouldlimittheprocessingthatitdoestoavoidslowersystemperformanceandshorterbatterylifeinmobilescenarios.Touchdevicesshouldprocessasmuchastheycaninfirmwaretoprovideanoptimaluserexperience.DriverModelIfyouprovideadriver,werecommendthatyouwriteaKMDF-basedlowerfilterdriver.YourdrivershouldprovidethesamefunctionalityasaHIDminidriver,butregisterasafilterdriverunderaminimalWDMdriver(alsoknownasashimdriver).AshimdriverisnecessarybecauseKMDF1.9doesnotnativelysupportHIDminidrivers.InWindows7andlaterversionsofWindows,youcanusethesystem-suppliedMshidkmdf.sysdriverasashim.Mshidkmdf.sysisnotsystem-suppliedinearlierversionsofWindows.IfyouaresupportingversionsofWindowsearlierthanWindows7,youcanbuildtheshimdriveryourself.TheWDKcontainsthesourcecodeforthisdriver,inthesrc\hid\hidusbfx2\hidmappersubdirectory.Formoreinformationabouthowtobuildtheshimdriver,seetheHYPERLINK"http://msdn.microsoft.com/en-us/library/ff5433