This requests the next broadcast frame of the specified page. The frame, when retrieved, is stored in the cache, and this process will repeat until all subframes of the specified page have been retrieved and stored.
There is special handling to cater for some teletext services which broadcast each subframe twice.
Frame searching will time out after 90 seconds, if nothing is found.
If you want to retrieve only a specific single-frame page, you should use getframe() instead.
RISC OS will time out a frame request after 60 seconds.