User equipment, storage medium, service center and method

A user equipment comprising:

• a user interface,
• a communication part for communication via a communication system, and
• a client for maintaining information about contacts, said client being arranged to:
• trigger transmission of information identifying a plugin to a predetermined receiver in response to detection that said plugin is installed in the user equipment,
• receive via the communication system information identifying plugins installed in user equipments of contacts whose information is maintained in the user equipment, and
• display on said user interface information identifying plugins installed in a user equipment of a contact in response to a selection of said contact performed via said user interface.

A service center of a communication system comprising:

• a data storage for maintaining information for user equipments, and
• an access control part for identifying user equipments communicating with said service center and for verifying their authorization to obtain data available in said data storage prior to allowing access to said data,
• said service center being configured to:
• receive from a user equipment and store in said data storage information identifying plugins installed in said user equipment,
• maintain for said user equipment a list of subscribers authorized to have access to said information identifying installed plugins, and
• provide subscribers, which according to said list are authorized to have access, with access to said information identifying installed plugins.

A method of maintaining information for a user equipment, comprising:

• receiving information identifying plugins installed in a user equipment from said user equipment,
• storing said received information in a data storage,
• maintaining a list of subscribers authorized to have access to said information stored in the data storage based on information received from said user equipment, and
• providing subscribers included in said maintained list with access to said information stored in the data storage.