In one embodiment, methods and apparatus for an operator of a console to authenticate to a system of heterogeneous computers by logging in only once to a representative computer or core. An instance of an EntityBean object is provided with both a primary key and a domain key class. Alternatively, a separate indication, such as a second count representing the number of new unread electronic messages received, or some other symbol, such as an explanation point, can be displayed. The memory block reading measure activates one of the 1st through Nth memory blocks for instruction code reading, and executes instruction code reading from the activated memory block.