Are scanned classes isolated?

Is it possible to access Informations from other classe while scanning a class?
If class A is being scanned right now, is it possible from this scanning process to access informations about all other classes within the codebase?

Short (and so oversimple) answer is no.

Longer answer : that depends a lot about what you are after : could you try to describe what you are trying to achieve ? you may be able to access quite some information already.