https://manpages.ubuntu.com/manpages/xenial/man3/XmDropSiteConfigureStackingOrder.3.html
Ubuntu Manpage: XmDropSiteConfigureStackingOrder - A Drag and Drop function that reorders a stack...
A Drag and Drop function that reorders a stack of widgets that are registered drop sites "XmDropSiteConfigureStack\%ingOrder" "Drag and Drop functions"...
drag and dropubuntumanpage