Connecting your Macintosh to the Internet gives millions of people direct, uncontrolled access to your hard drive and data. If you do not protect your Macintosh from unwanted intrusions, you are vulnerable to an attack. A firewall provides secure technology that regulates both incoming and outgoing communications. NetBarrier is a personal firewall, which means that it protects and monitors all incoming and outgoing data on your computer. A port allows data to enter and exit a computer.
Some ports are specific while others are general.
There are two types of pings. One is sent automatically by the server and the other is sent manually by a user. Servers use the ping command to check if a connection is still active. A ping sent by a user tells how long the signal took to go from the user's computer to the pinged computer. A. No, the program has been optimized for the PowerPC processor family, and cannot run on older 68K processors even if MacOS 8.1 is installed on the computer.