13. The storage medium of claim 8 , wherein said program code for acquiring is operative to be performed periodically in order to provide a time-dependent component to said user profile.
13. The storage medium of claim 8 , wherein said program code for acquiring is operative to be performed periodically in order to provide a time-dependent component to said user profile. 14. The storage medium of claim 13 , wherein said time-dependent component is used to modify an expected search frequency.