PowerPoint Viewer SDK Control ReferenceProperties SerialNumber PowerPoint Viewer ActiveX Control SerialNumber For full version to activation your license. pptviewerObj.SerialNumber[=string] Parameterstringthe string of serial numberRemarkThis property is Read/Write. Example Visual Basic SyntaxPublic pptviewerObj As ObjectSet pptviewerObj = CreateObject("POWERPOINTVIEWER.PowerPointViewerCtrl.1")pptviewerObj.SerialNumber="yourserialnumber"