Anyone might have flashlights or other anodized aluminum items they wish to engrave. This Instructable shows how to mark anodized aluminum flashlights - both flat and curved.
This work was done at TechShop, in Round Rock, Texas!
Draw your marking design in a drawing package, like Adobe Illustrator or CorelDRAW. Either one can output the proper format files. I chose Illustrator because I have it and am experienced with it.
Note that TechShop provides many apps for driving the laser cutter/engraver and the drivers, allowing direct output from those apps to the engraver. This means you can bring your native format files for these programs, such as AutoCAD, Illustrator, CorelDRAW etc. Check with your TechShop or other provider of equipment time to see what apps they support, or if you must bring an intermediate format.