In {HEAD ~ a method} for operating {TAIL ~ 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 at least one content 
In { HEAD ~ a method } for operating { TAIL ~ 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 at least one content
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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