Objects of class Parser have no Active Object wrapping, as they are created on the fly by the server.
There is one Parser per player connection. It accepts input from the Connection object, parses it, and goes looking for verbs that match it, which are then called with the parsed arguments.
There are, however, situations in which entering new commands should not be possible. In particular, situations in which user input is required to complete a command, such as a yes/no dialog. For these occurences, a procedure on the Parser object is passed down the call chain. This procedure can be used to suck additional input. It uses a simple capability which is revoked as soon as the procedure returns back to the parser.