Specifies a general-purpose attribute that can be used to store the handle of any GUI object. This attribute is not used by Natural itself.

Applies to	Dialogs (all types) and all dialog elements, date/time picker control, dialog bar control, image control, image list control, list view column, list view control, list view item, progress bar control, slider control, spin control,tab control, tab control tab, tree view control, tree view item, wallpaper control.
Data Type	HANDLE
Default Value	NULL-HANDLE
Possible Values	NULL-HANDLE / any dialog or dialog element handle