I'm writing a backstory for my character in SR4. One of the characters in my backstory is a little girl who would have been considered an Otaku (though not in any of the crazy cults) and would have eventually grown up to be a Technomancer had tragic circumstances not befallen her. Anyway, her parents are old 2nd/3rd ed. Shadowrunners. Mom's an Elven Mage, and Dad's a Human Decker. Long story short, little girl starts exhibiting strange behavior (influenced by her connection to the matrix). Would Mom be able to see her daughter's resonance using assensing?
From everything I've read, Resonance, and Essense work nearly the same. Implants and Cybernetics reduce both equally. Your ability to summon, or compile a sprite are very similar. You can attempt to increase the rating of a complex form, much the same way as attempting to raise the force of one of your spells. In all ways, it appears as though Technomancers are the matrix's Mage. (please correct me if I'm incorrect on any of this)
That being said, I haven't seen a version of assensing for Technomancers. Two Technomancers crossing path's don't seem to have a way of identifying each other, unless they introduce themselves, or strip search each other looking for comlinks. So, question stands: Can a Mage, tell the difference between a normal metahuman, and a Technomancer using Assensing?