FreeBSD Manual Pages
- syscons(4), sc(4)
- the legacy console driver
- XtClass(3), XtSuperclass(3), XtIsSubclass(3), XtCheckSubclass(3), XtIsObject(3), XtIsRectObj(3), XtIsWidget(3), XtIsComposite(3), XtIsConstraint(3), XtIsShell(3), XtIsOverrideShell(3), XtIsWMShell(3), XtIsVendorShell(3), XtIsTransientShell(3), XtIsTopLevelShell(3), XtIsApplicationShell(3), XtIsSessionShell(3)
- obtain and verify a widget's class