1. A command device comprising a plurality of interactive command sources enabling any number of heterogeneous systems to be accessed, wherein each command source has a configuration and is reconfigurable according to a plurality of configurations associated respectively to said heterogeneous systems, each command source comprising a means for introducing commands of a first type for configuring said command source according to a configuration associated with one of said systems, and commands of a second type specific to each of said configurations and therefore to each of said systems enabling the transmission of command messages to the system concerned, and wherein each system comprises means for transmitting just after an execution of a command of said first or second types, information relating to a status of the system for updating a system status display, perceptibly on the command sources situated in the configuration corresponding to said executed command, and blindly in memory spaces allocated to the command sources situated in other configurations.