The small blue mill nearly works now. It uses the Rstep gcode interpreter.
To operate the mill, we use the software located at C:\blue_mill\jrStepGUI_110128.jar on the robot room machine. Files that Lisa originated are now in C:\blue_mill\CNC Mill (they had been in My Documents or Desktop or something).
A table of all the commands accepted by this machine is available at the Gcode article.