A printing system includes a host apparatus and a printer. The host apparatus includes the following sections. A user inputs through an inputting section first identification information and a command having either a first function or a second function. An authentication section performs authentication based on the first identification information to generate authentication information indicative of whether the user is an authorized person. The host apparatus communicates and the printer communicate with each other via transmitting and receiving sections. First setting means runs on the host apparatus and allows activation of the first function of the printer. A controller controls the aforementioned sections. The printer includes the following sections. Second setting means is activated by the controller and runs on the printer, allowing activation of the second function of the. An identification information decision section determines based on the authentication information whether the command is allowed to be activated.