Object Collector
From MohidWiki
The Object Collector is a derived type array, placed in class GlobalData, where, in each array position, information is stored about the corresponding class instance. This information relates to the ID number of an object (InstanceID); the number of client objects associated to it (USERS) i.e. that can have access to it; the number of client objects reading information from it (READERS); and the object state (READ_LOCK).