TNC stands for Transportation Network Company, a term defined in a recently enacted part of the State Vehicle and Traffic Law. A TNC is a business, also known as a "rideshare company," licensed by the DMV to use a digital network to connect passengers with TNC drivers for preset trips.
Can a driver be authorized by more than one TNC?
That depends on the TNC you want to work for, as there is no legal limit to driving more than one TNC
You've got it. Another query about Veteran Indicator What exactly is the refund fee that I've read about?
It might be the one about applying to have the Veteran Indicator added to your license, permit or non-driver ID and if you were charged a document fee, you are entitled to get a refund for the fee
Do all these new IDs and licenses have rules on how they can be used when crossing the border into Canada?
Yes, you can learn more about Enhanced , REAL ID and Standard documents on our site. I can link you to our page so you learn more about U.S. Border Crossing from Canada, Mexico and some Caribbean countries
can I do my new ID online if I want both the new real ID and the word VETERAN printed on it?
Do you have a Standard license and want to change to a REAL ID or Enhanced ID  and also add your veteran status?
yes