From Tech Artists Wiki
Biped, previously known as Character Studio, is a built-in rigging component of 3ds Max. It has been used in a number of productions and is continually being updated. It often undergoes harsh criticism, however, for its lack of script-friendliness and flexibility, and plethora of bugs and obfuscation of the 'behind the scenes' work. The consensus amongst technical animators (and the personal opinion of this author) is that, while good for small productions or studios lacking a rigger or technical animator because of its accessibility, ease of use, and ample documentation, it is not a good choice for larger productions, where a custom rig, or an investment in a rigging plugin such as PuppetShop or CAT, would be more worthwhile.