I have Millmage on three computers in my home, with 2 in the office & media room and one in the garage connected to the YoraHome Silverback CNC. If I design something in either my office or in the media room computers which aren’t connected to the CNC, does the file work on the Garage CNC if I have setup the dummy CNC in these two computers. They are all connected via a wireless network
Thankyou
Yes it’s possible and easy to do. I am in the same situation with 3 computers.
Exporte the preference from your computer that is controling your CNC. Including the config of the Device (CNC).
Import it on your 2 others computer. It will work even if there is no CNC connect to them.
Transfer your project Files.Mage via a network.
My third computer is at work, I put my files on Google Drive. 
I found that Chrome Remote Desktop very handy, it’s worth a look 
Chrome Remote Desktop - Chrome Web Store
I also do as mseguin suggested’, I keep my MM files on my remote desktop and have a mapped network drive…all in all works great.
I have a similar setup but I finally dug deeper on Windows OneDrive and actually like to keep the files synced. I also have the OneDrive app on my Mac if I need access. Should have done it before. I know Google has same ability bu decided to stay with Microsoft.
I have a computer in the house and two in the shop. I can design on the one in the house then save the job to a shared drive, open it with the computer attached to the CnC and run it. I could run the job from the house but I never do for obvious safety reasons.