Apparatus and method for tracking world wide web browser requests across distinct domains using persistent client-side state

A computer readable memory that can be used to direct a client/server computer network to function in a specified manner, comprising:

• a first set of instructions, executed at a first server computer with a first domain name, to identify a first request from a web browser of a client computer;
• a second set of instructions, executed at said first server computer, to assign said web browser a unique identification code;
• a third set of instructions, executed at said first server computer, to direct said client computer to convey said unique identification code to a second server computer with a second domain name distinct from said first domain name;
• and
• a fourth set of instructions, executed at said second server computer, to associate a second request from said web browser at said second server computer with said unique identification code.