If you have a registered license, you can go the with Machsupport.com web
site and log in to use the License Maintenance button to issue additional
licenses to yourself for up to a total of 5 computers for hobby use.

Perfect.  I had read somewhere that M4 did not allow more than one computer per license.  Glad to hear that is incorrect.  I am waiting for a HDMI to VGA converter I want to use to attach an older monitor to the LP (the 7" screen is just not "old eyes" compatible).  I probably sound like a real cheapskate using all this minimal hardware, but more than the cost savings, I want to see if it can be done.  I am definitely a Journey over Destination kind of guy.

Next question:  I bought M4 as a package deal with a PDMX motion controller.  I am assuming that this was the "hobby" version.

Never mind this question. Figuired it out.