Sets the width of the bottom margin for the background image of a page.
Related Variables: DispMgrBMPMarginBottomDispMgrBMPMarginLeft |DispMgrBMPMarginLeftDispMgrBMPMarginRight |DispMgrBMPMarginsWin |DispMgrBMPMarginTop
Section: System
Default: DispMgrBMPMarginBottom = 0
*No restart required (Settings.Dynamic property)
