What kind of URLs a frame accepts in the calls to XDispatchProvider::queryDispatch ,
and how the returned dispatcher handles dispatches is completely implementation dependent
(though of course the restrictions of XDispatchProvider must be met).
Frame implementations may (optionally) support special targets in the call to
XDispatchProvider::queryDispatch .
Such special targets are passed as target frame name. They may, in addition,
require special frame search flags (see FrameSearchFlag ), or,
in opposite, limit the set of allowed flags.
Common special targets include:
- _blank is used to create a new frame when dispatching the URL.
- _self forces the frame to dispatch the URL into itself.
- _parent dispatches the URL into the parent frame.
- _top dispatches the URL into the top level frame, the frame where this is invoked belongs to.
- _helpagent dispatches the URL into the help agent window belonging to the frame.