Information flow is controlled in a digital network by providing a control
server that is linked to server units in the digital network by means of instructions
stored in the server units. When predetermined conditions are satisfied, a first
server unit being visited by a user sends an instruction to the user, which causes
the user to send information to the control server. Based on the information, conditions
for renewing contact with the control server are sent back to the user. When these
conditions are satisfied, contact with the control server is renewed, and the control
server selects a second server unit and sends an instruction that enables the user
to visit a web site served by the second server unit. The second server unit preferably
includes information related to information included at the first server unit.
