Function AddAppWindowDropZoneA 

pub unsafe fn AddAppWindowDropZoneA(
    WorkbenchBase: *mut Library,
    aw: *mut AppWindow,
    id: ULONG,
    userdata: ULONG,
    tags: *const TagItem,
) -> *mut AppWindowDropZone

libname: “workbench.library” (V44) (Kickstart 3.5 / 1999)