keep SESSION using wget?

Dear list, I wrote a php script to keep track of a remote server. This script is called every 10 minutes via http by a cronjob using wget. The cronjob calls (from the remote server) open a new session each time. This way I cannot use session variables to limit mail notifications to cases where the IP of the remote server has changed. Is there any way to - either make wget to stay within its session - or store the IP in a static variable that is persistent? Thanks Ralf