Say I have a Technomancer. That Technomancer, for all purposes has a Node in their head. Is there anything stopping a DI PC making his Home Node within the Technomancers Brain Node? I cannot find anything in the RAW that suggets they cannot. I am aware a GM Fiat might say no, and I don't really intend to ever try it but I am curious on peoples thoughts.

Only other technomancers can access their Brain-Node.

Is that ever declared? I know it is shown that normal Hackers cannot Hack into the Bio-Node, but is it stated that the Technomancer cannot let them in?

That's all Unwired says on the subject.

I think it might be a problem that the biological node has no capacity to store data, since data is all an AI is. I reckon an AI could visit, but how would it live there?

I've taken what it says in Unwired about the brain node to mean only resonance beings can hack into a techno, and since AI's have no resonance...

AI's for all their mystery are creatures of bits and bites, Technomancers and Sprites are creatures of "mag....resonance" the two are not compatible.

Emphasis added.

AIs are either programs (due to the fact that they were once Pilot/Agent Programs), a lot of data (since they have to realign and make a home node), or a combination of the two.

CodeBreaker should stop posting when it is so early in the morning for him. Even I can see that that was a silly suggestion in the light of day

Of course, you could tailor a Free Sprite after an AI, have it make it's Resonance Node in a Elven Technomancer's Brain-PAN (bu-dum bum) a-la Posession, and use that super-character as a BBEG for a runner's group... That warrants some looking in to. And just to have fun, make it a Dissonance TM/Sprite.

Because we all know that GMs are allowed to bend/pretzel/break rules whenever they want.

Yup, I've done a spellcasting AI once as an NPC.

Since when coul Technomancers cast spells?

EDIT: Oh, the "Because we all know that GMs are allowed to bend/pretzel/break rules whenever they want." part. Got it.