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Glossary

This glossary defines many of the terms used in this book. It includes terms and definitions from "Internetworking with TCP/IP" by Douglas E. Comer, Department of Computer Sciences, Purdue University, West Lafayette, IN 47907.

### Glossary Listing

#### A

Auto-launch map
  Launch map is a function for managing multiple PCs on which Desktop On-Call is installed. Auto-launch map is an enhanced version of launch map. Desktop On-Call broadcasts a query request in the sub-net and makes a list of all PCs on which Desktop On-Call is installed. Any sub-net can be included as the broadcast target.
Auto-update
  Auto-update is a function that checks whether the version of Desktop On-Call is the latest, and if not, offers guidance on how to update to the latest version.

#### B

Basic connection mode
  Basic connection mode is the traditional way of connecting used in Desktop On-Call Version 2.5. Desktop On-Call Version 3 supports Enhanced connection mode in order to support SSL, multi-windows, and file transfer. Desktop On-Call, however, requires Web browser on the guest PC to have functions, Java Script 1.2, Live Connect. Desktop On-Call will use Basic connection mode if it idetects that the browser on the guest PC has no Java Script1.2 and LiveConnect functions.
broadcast
  A packet delivery system that delivers a copy of a given packet to all hosts that attach to it is said to broadcast the packet. Broadcast may be implemented with hardware(e.g., as in Ethernet) or with software(e.g., as in Cypress).

#### C

Connection Wizard
  Connection Wizard will check your host PC's network environment and help you to setup the modules if they are not installed.

#### D

Directed Broadcast address
  An IP address that specifies "all hosts" on a specific network. A single copy of a directed broadcast is routed to the specified network where it is broadcast to all machines on that network.

#### E

Emulation buttons
  There are varios special keys, such as Alt, Ctrl, and Ins. These keys work in the Web browser of on the guest PC side, so a Java applet cannot determine whether they are pressed. Desktop On-Call support these special keys as emulation buttons.
Enhanced connection mode
  Desktop On-Call Version 4 provides the enhanced connection mode in order to support multi-windows, SSL and file transfer. This mode requires the Web browser to have the following functions: Java script 1.2 (or higher), Live connect and JDK 1.1 (or higher).

#### F

#### G

Guest PC
  The guest PC means the PC controlling a host PC. The user operates a Web browser on a guest PC. There are a host PC and a guest PC in the Desktop On-Call network environment. First of all, the user starts a Web browser in a guest PC, and input a host PC's URL address in the URL address field of the Web browser. Then the same desktop image of the host PC will be drawn in the Web browser and the user will be able to operate the host PC remotely.

#### H

Host PC
  The host PC means the PC to be controlled. You need to install Desktop On-Call on a host PC. The Desktop On-Call network environment contains a host PC and a guest PC in . First of all, user starts a Web browser in a guest PC, and input a host PC's URL address in the URL address field of the web browser. Then the same desktop image of the host PC will be drawn in the web browser and the user will be able to operate the host PC remotely.

#### I

Instruction pointer
  You can indicate a location on the screen by using the hand-shapled instruction pointer when you give instructions on how to use application software.

#### J

#### K

#### L

Launch map
  Launch map is a function for managing multiple PCs on which Desktop On-Call is installed.

#### M

#### N

#### O

Original Launch map
  Launch map is a function for managing multiple PCs on which Desktop On-Call is installed. Desktop On-Call allows you to use your own original HTML files instead of Desktop On-Call's ready-made Launch map.

#### P

Ping
  (Packet Internet Groper) The name of a program used with TCP/IP Internet to test reachability of destinations by sending then an ICMP echo request and waiting for a reply. The term is now used like a verb as in, "please ping host A to see if it is alive."

#### Q

#### R

#### S

Subnet address
  An extension of the IP addressing scheme that allows a site to use a single IP network address for multiple physical networks. Outside of the site using subnet addressing, routing continues as usual by dividing the destination address into a network portion and local portion. Gateways and host inside a site using subnet addressing interpret the local portion of the address by dividing it into a physical network portion and host portion.

#### T

#### U

#### V

#### W

#### X

#### Y

#### Z