SharePoint Reminder - Components

SharePoint Reminder has 3 components -

Reminder Web Part
  This SharePoint Web Part lets users configure SharePoint Reminder.
Reminder Service
  This NT Service runs constantly in the background monitoring the data in your SharePoint lists and sending emails according to the rules you have setup using the Reminder Web Part.
Configuration Utility
  This utility allows the SharePoint Administrator to change the configuration of the SharePoint Reminder system.