Specifications

Trend Micro™ OfficeScan™ 10 Administrator’s Guide
A-4
HTTP
Hypertext Transfer Protocol (HTTP) is a standard protocol used for transporting Web
pages (including graphics and multimedia content) from a server to a client over the
Internet.
HTTPS
Hypertext Transfer Protocol using Secure Socket Layer (SSL). HTTPS is a variant of
HTTP used for handling secure transactions.
ICMP
Occasionally a gateway or destination host uses Internet Control Message Protocol
(ICMP) to communicate with a source host, for example, to report an error in datagram
processing. ICMP uses the basic support of IP as if it were a higher level protocol,
however, ICMP is actually an integral part of IP, and implemented by every IP module.
ICMP messages are sent in several situations: for example, when a datagram cannot
reach its destination, when the gateway does not have the buffering capacity to forward
a datagram, and when the gateway can direct the host to send traffic on a shorter route.
The Internet Protocol is not designed to be absolutely reliable. The purpose of these
control messages is to provide feedback about problems in the communication
environment, not to make IP reliable.
IntelliScan
IntelliScan is a method of identifying files to scan. For executable files (for example,
.exe), the true file type is determined based on the file content. For non-executable files
(for example, .txt), the true file type is determined based on the file header.
Using IntelliScan provides the following benefits:
• Performance optimization: IntelliScan does not affect applications on the client
because it uses minimal system resources.
• Shorter scanning period: Because IntelliScan uses true file type identification, it
only scans files that are vulnerable to infection. The scan time is therefore
significantly shorter than when you scan all files.