In {TAIL ~ a method} for operating a computer system connected to a telecommunication network and provided with a data memory for storing communication data, a data trace is compiled from parameters selected from time, at least one position designation, and {HEAD ~ at least one content} 
In { TAIL ~ a method } for operating a computer system connected to a telecommunication network and provided with a data memory for storing communication data , a data trace is compiled from parameters selected from time , at least one position designation , and { HEAD ~ at least one content }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD