How do I determine what post processor I have on my shop built CNC. There are about a million to choose from on Vcarve Pro

You will probably have post processors like the following listed: Mach2/3 ATC Arcs (inch) Mach2/3 ATC Arcs (mm) Mach2/3 Arcs (inch) Mach2/3 Arcs (mm) Mach2/3-WrapX2A ATC Arcs (inch) Mach2/3-WrapX2A ATC Arcs (mm) Mach2/3-WrapY2A ATC Arcs (inch) Mach2/3-WrapY2A ATC Arcs (mm) If you have an Automatic Tool Changer, use the post processor with the ATC in the name. For most applications and if you don't have an ATC (automatic tool changer), use the Mach2/3 Arcs (inch) or (mm) post processor. Additional Information: