"There was a Poser version for Max called Character Studio."

Character Studio had nothing to do with Poser, it was (originally) a Max plugin for rigging/ animating bipedal models (typically) built w/ Max. It's now included in newer Max versions.

"Is Posetta V1 ?"

Nope. Poser 4 Nude Woman. Included with P4. P4 Nude Man was affectionately nicknamed "Dork"

WARNING!

This user has been known to swear. A LOT!