Hello,
The Background Remover 3.0 (launched April 2008) unlike v2 and earlier does not have button 'Apply'.
The new version is fully interactive.
You can use "Magic Wand" and "Magic Fill" tools for object extraction.
When you press and drug left mouse button you erase background when you use right-mouse button- restore object.
УMark objectФ and УMark backgroundФ tools make marks that help other tool understand what you want to extract.
Background Remover User's Manual you can find at
http://www.imageskill.com/backgroundremover/br_manual.pdfRegards, Dmitry