A printer may comprise a command file storage unit, a receiving unit, a command file sending unit, and a first data sending unit. The command file storage unit may store a command file including a first command, a second command, and a third command. The first command is a command for sending a request for first data. The second command includes design data, and is a command for converting the first data into second data in accordance with the design data. The third command is a command for displaying a web page in accordance with the second data. The receiving unit may receive a request. The command file sending unit may send a response including the command file when a request for the command file is received. The first data sending unit may send a response including the first data when the request for the first data is received.