Yes, the TMTnet can be programmed freely because it is very simple, only reading and writing 2 Z80 ports from Basic, machine code or other language, but the protocol will need a server to manage all the communications, as it is planned a huge interchange for 16000 users.
Maybe you mean a peer 2 peer connection between 2 computers. I think it is possible if the Wifi module admits it. I will ask Hans about it.
I am already a humble amateur, only one of the beta-testers of the system..... but please, ask what you don't understand.
For Hans it is also a hobby, although he is a skilled professional working as Engineer.
Prodatron(Jorn Mika)...., he is on another galaxy. A mysterious skilled programmer and also the financier of the SF3 project. He is the main reason because this project will not dead.
But don't worry about this project disappearing , SF3 is real hardware. It works on the Enterprise and needs Enterprise programmers to squeeze its juice, but not only skilled ones, base users can create wonderful Basic listings. Had I said it before....? Almost all its characteristics can be managed from the Basic editor.
Of course, the are still some lacks that depend on other Enterprise projects. I mean, a driver for the USB pendrive/SD on the SF3, that I think will be delayed until Bruce releases the new EXDOS with FAT16 support.