Gary, how did this crosshair work? Does it trigger a switch, or simply shine a dot onto a position?
If it is a switch per axis, they need to be wired into the card. See the attached .pdf file. You then set up the DeskCNC homing under the Machine Setup Configuration tabs. Tick Home using Lim in the DeskCNC Setup tab, and configure your parameters in the Home Script tab. See the typical settings in the attached txt file.