Some recorders have a "Chapter Mark" button on the remote, which sets a chapter mark at the current playback position. Other recorders have to go through a menu system to be able to set chapter marks.

This option tells whether or not it is possible to record a programme, watch it time shifted (ie. while it is still recording), and while watching it, pause the playback, frame step backwards and/or forwards and then manually set a chapter mark at the proper frame.