GETCHILDREN Get member IDs of given collection GETOBJECTBYQUERY Get object IDs matching given query GETANCHORS Get anchor IDs attached to given doc GETOBJECT Get object record with given ID GETANDLOCK Get object record and lock CHANGEOBJECT Modify object attributes UNLOCK Release lock on given object PIPEDOCUMENT Retrieve document on given port INSERTOBJECT Insert new document, collection, or link DELETEOBJECT Delete object with given ID COMMAND Stat, who, message, etc.