user to user

Hi,

I am looking for a way to allow a user (who I'll call "User1") to send field data from within their profile to User2 (User2 is defined by User1).

By "send" I mean to make this information accessible to User2 and to give User2 some kind of alert or new display when they login that the information has been made accessible.

Is this possible using existing Drupal modules? And if so, which ones? I am still fairly new to the Profiles as Nodes modules, so please bear with me. Any support is greatly appreciated. I am using Drupal 6. Thanks!