From http://www.imperial-library.info/obscure_text/vehk_teaching.shtml:
What is the Tower's secret?
How to permanently exist beyond duplexity, antithesis, or trouble. This is not an easy concept, I know. Imagine being able to feel with all of your senses the relentless alien terror that is God and your place in it, which is everywhere and therefore nowhere, and realizing that it means the total dissolution of your individuality into boundless being. Imagine that and then still being able to say "I". The "I" is the Tower.
Compare this to Zero-Sum, the state that Moth priests seek, in which they achieve profound enlightenment -- and then dissolve into nothing. CHIM is achieving such a profound insight into the nature of things, and still possessing an individual identity.
So, yes, if it is possible to achieve CHIM, then two individuals can achieve CHIM, and still be distinct individuals. That's much of the point, really.