There is an option on just where to save the files when you do a save of the cnc file (CAM drawing). I use the Drawing directory under "My Documents\PartMaster". When you select the Execute PostProcessor, the pop-up will let you pick the PostProcessor file and put in the file name and extension of the g-code file. Select OK. It has just created a file in the Drawings folder with the file name you put in and the extension.
Just share the Drawing folder, or whatever you decide to use, and let Windows connect and copy the file like any other.
If you are totally lost, just do the post processor with a known file name and then do a file search in Windows to find where it is being put. Once you know that, you can move or share it so you can pick it up from another machine.
Hope this helps. It would be nice if you were given the option of where to create the g-code file at the time the post processor runs. Maybe in the next version.