It is used to generate an activation code from a "request code" provided by the software during an offline activation attempt.
As newer versions of AutoCAD and other software are released, compatibility issues can arise, especially with newer operating systems and file formats. xfadsk64 autocad 2014 upd
Since AutoCAD 2014 is outdated and the "X-Force" route is dangerous, here is what you should actually do: It is used to generate an activation code