This class provides the resident object table for the mirrors. A mirror represents a remote JavaScript object or any remote concept that needs to be identified such engines or contexts which are not JavaScript objects. A mirror has a unique identifier allocated on the server. This is called its oid, for object identifier. The oid is not only carrying the identity but also the type of the remote object. Knowing the type is essential when a mirror has to be created. For instance, it is important to know if a remote object is just an object or a reified code as a script or a function. The oid is a long, the high word is the type (tid), the low word is the unique identifier (uid). The unique identifier is globally unique across all types. This class also acts as the factory for mirror objects. When a mirror is created, it is remembered in the resident object table for later rebinding from its uid.