When the scanning engine searches through files it compares the contents
of the files to the contents of the detection definition (DAT) files. These DAT
files contain known signatures of viruses that have been found. If the scanner
finds a match it uses other DAT files to determine how to clean and counteract
the damage created by the detected virus.
CAUTION:
If the signature of a certain virus is not contained
in any of the DAT files, that virus will not be detected by the scanning
engine. Also, the scanning engine must be the latest version to be able to
fully utilize the latest DAT files.