Abstract: A method and arrangement in a computer client/server constellation provides a web page information element monitoring service to a subscribing user. The client part (100) in co-operation with the first browser, operated by the user, acquires a user specified web page, generates a position specifying unique first ID on basis of a user selected first information object contained on the web page, and transfers the first ID to the server part (600). The server part (600), in co-operation with a second browser, reacquires the web page and generates a second unique ID on basis of a second information object found at a position provided by the first ID, and generates a change indicator if the second ID is different from the first ID. The change indicator triggers a notification of the detected change to the subscribing user.