a local area network lan a wide area network wan a public switched telephone network pstn a integrated services digital network isdn an infra red ir link a radio link like universal mobile telecommunications system umts global system for mobile communication gsm code division multiple access cdma or satellite link a variety of transmission protocols data formats and conventions is known for example as transmission control protocol internet protocol tcp ip hypertext transfer protocol http secure http wireless application protocol wap unique resource locator url a unique resource identifier uri hypertext markup language html extensible markup language xml extensible hypertext markup language xhtml wireless markup language wml standard generalized markup language sgml interfaces coupled between the elements are also well known in the art for simplicity interfaces are not illustrated an interface can be for example a serial port interface a parallel port interface a game port a universal serial bus usb interface an internal or external modem a video adapter or a sound card computer and program are closely related as used hereinafter phrases such as u201c the computer provides u201d and u201c the program provides u201d are convenient abbreviation to express actions by a computer that is controlled by a program fig2 to 4 depict flowcharts of an inventive method depicted are on either side of the vertical dashed line a first service and a second service respectively the interactions between the services are depicted by dashed lines running from left to right and vice versa initially a first service is started in step 2 by that.