A portable computer terminal having an operating system configured to switch from a first state to a second state in response to a first command from a user and to switch from the second state to the first state in response to a second command from the user, the second command including inputting an identification code of the user, the operating system being capable, in the first state, of causing execution in interactive manner of an application selected from a set of applications, the operating system being capable, in a second state, of causing execution in interactive manner of an application of said set of applications in compliance with an access condition, wherein the access condition is determined as a function of said first command.