• When you log in to chat, you connect to Internet Relay Chat (IRC) servers on the Internet and join others in the numerous 'channels' on the IRC network.
• When you use Telnet to connect to a server on the Internet and execute commands 'on' the server from your computer.
• When you use FTP to transfer files from a remote server to your computer. FTP is the File Transfer Protocol for exchanging files over the Internet, and works in the same way that HTTP and SMTP do in transferring Web pages from servers to user's browser and transferring e-mail across the WWW respectively.
• When you use NetBIOS (Network Basic Input/Output System) to communicate with another user on the LAN; the LAN could in turn be connected to the Internet. NetBIOS insulates the applications that users use to communicate with one another, from understanding the underlying network details.
• When you are a part of a Virtual Private Networks (VPN). These private network connections communicate 'securely' over a public network, such as the Internet.
• When you browse the Web.
• When you send/receive e-mail.

How eConceal works?
eConceal allows the user to choose the types of Internet access to allow and those which are a strict no-no. The user can set rules to control network access from and to their system. Rules are user selections of Internet access types to allow or block on the system.

eConceal firewall provides the user with a set of pre-defined rules which can be added to the firewall by selecting those that are appropriate to their security needs. Users can define their own 'rules', and when they don't feel the need for any of the rules they've 'added', they can remove it. Among the pre-set rules involving Internet access that eConceal offers the user to select are: ARP, DHCP & BOOTP, DNS, E-mail, WWW, News, NetBios, FTP, ICMP, ICQ, Telnet & SSH, IRC, MSN, and VPN. Internet access involves the usage of these functions in one form or the other.

The rules function as filters, analyzing packets (small chunks of data) to check if they fulfill the filter criteria, passing them to the requesting system if they do, else they're discarded.