Sets all four margins around a background image in a windowed page.
Related Variables: DispMgrBMPMarginBottom | DispMgrBMPMarginLeft |DispMgrBMPMarginLeftDispMgrBMPMarginRight |DispMgrBMPMarginsWinDispMgrBMPMarginTop
Section: System
Default: DispMgrBMPMarginsWin = 0
*No restart required (Settings.Dynamic property)
