A single client session may be managed such that two or more virtual instances are presented without regard to technologies of the different virtual instances. Individual ones of the two or more virtual instances may be of a virtual environment or a virtual space. A first virtual instance may be loaded into the client session responsive to a user being authenticated for the first virtual instance based on received authentication information. A second virtual instance may then be loaded into the client session responsive to the user being authenticated for the second virtual instance based on the same received authentication information. Information associated with the user, information associated with a user character controlled by the user, and/or other instance services may be provided to the first virtual instance and/or the second virtual instance. Individual ones of the virtual instances may be monitored for a runtime error and/or memory abuse.