"Probably your best use then would be for staying in contact with scouting teams, or as a back-up emergency broadcast if something goes wrong, but I'll have to talk to Rian."

"The usage limits of ours are somewhat on amount, but there's a massive jump in resources from 'one' to 'two' and a smaller jump from 'two' to 'two thousand.'"

Affirmative.

Interesting, what principles lead to that? (Two thousand people?)

"Two thousand's just an example number. And it's - as far as I understand effectively a different, far more costly technique to target telepathy at more than one person, than at a single person. But once you have the boost in place to target more than one, it scales cleanly."

Interesting. Does it matter if you target it at one person and at a different person a second or several after that?

"That costs twice as much as targeting at the one person, since you're just doing the same technique over. And it's less efficient, especially in emergencies."

Understood.

They should likely test to be sure she can telepathically contact people here as she is accustomed to, in case there's something about being of different worlds or chakra interactions that would interfere or otherwise affect it.

That's fine.

What does she need for a test? Can she test on Mariko?

Yes. They should likely go to separate rooms, so as not to confuse the data with in-person nonverbals, and Mariko will need to arrange her mind to active consent.

"Alright. Is now a good time to test?"

Good with her.

Then they can go into separate rooms to try this particular experiment.

She sets her mind up for telepathy, and to Mariko specifically.

Hello.

'Hello! I can hear you just fine.'

Convenient. 

Would you mind a further test? I can usually appear to people mentally when I do this, and I'm interested to know if that would work as well.

'That's fine.'

Then, if this works, she will appear in Mariko's mind. (It's something like looking at a memory or imagining something with your eyes still open, but, depending on the strength of one's visual imagination generally, more real an image.)

'Works. Somewhat oddly, but it works.'

Oddly in what manner?

She describes it. 'It also feels different from how illusions manifest.'

In what way is that odd?

Ah, this isn't an illusion in our sense either, though I believe it was earlier observed the two are likely different.

'It's odd because I wasn't expecting it to work like this, though if it's normal for your system that's alright.'

Ah, I see. Yes, that seems fairly regular.

Are there any other tests I should perform?

She lists a few, mostly figuring out edge cases with the telepathy and what can be sent.

Depending on what they are, she can try them, or advise Mariko on trying, or note that there isn't a way to try them from her end in the system she is familiar with. 

The main things:

-Images

-Feelings

-Relay speed (testable with clones)

-Fidelity of information