firewall question?

Ping: A utility to determine whether a specific IP address is accessible. It works by sending a packet to the specified address and waiting for a reply. PING is used primarily to troubleshoot Internet connections. There are many freeware and shareware Ping utilities available for personal computers.

It is often believed that "Ping" is an abbreviation for Packet Internet Groper, but Ping's author has stated that the names comes from the sound that a sonar makes.

Endpoint Resolution: An endpoint can call and be called. It generates and terminates the information stream.

Remote access: The ability to log onto a network from a distant location. Generally, this implies a computer, a modem, and some remote access software to connect to the network. Whereas remote control refers to taking control of another computer, remote access means that the remote computer actually becomes a full-fledged host on the network. The remote access software dials in directly to the network server. The only difference between a remote host and workstations connected directly to the network is slower data transfer speeds.

ping means when you send a small packet of data and see how long it takes to be recived by server, it will see if any packet are lost on its journey.

remote access is when you allow someone/yourself to connect to your computer over the net so they can control it, it is like being infont of your system