You can search engraving and find lots of information already on the forum.
As previously mentioned in other threads, you will need to download the plug in called Eggbot for Inkscape (both free) to create a hatch fill for engraving. There are also hatchfills in other programs like Corel Draw.
Yes you can use the engraving tool in SCAL but would have to create the hatch fill engraving in another program - for now.
You can also google engraving on the Silver Bullet and go to
www.silverbulletcutters.com to see examples of engraving and some videos that will give you a feel for it.
I believe Penny has a video on her blog of the machine engraving and Lisa may as well - trying to remember!!