Start button search Guide

The Start button search in windows 7 is very intelligent. It can hunte for application and filename matches.
For example,If you search for "disk",not only applications appear,such as "Disk Cleanup" and "Disk Defragmenter",but also Control Panel such as "Protect your computer by encrypting data on your disk" or "Free up disk space by deleting unnecessary files".
In the features,I think Start button search will br more accessible.