Administrators can configure connection factories to assign client IDs to new connections. Alternatively, administrators can allow client programs to assign their own IDs. If the factory does not assign an ID, the program may set this property. However, it is illegal to overwrite an existing client ID value, and or to set this property after using the connection in any way (for example, after creating a session, or starting the connection); attempting to set this property in these situations results in
TIBEMS_ILLEGAL_STATE.