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N-Up Printing
The N-Up Printing extension lets you print up to 16 pages on a single sheet of paper. You can also put an optional border around each page drawn on a sheet.
Latest Version: n/a

Nag Notifier
Nag Notifier is a faceless background application. Although it goes into the Extensions folder, it is not an extension. It doesn't patch traps or cause extension conflicts. It is a normal application except it doesn't have an interface and doesn't show up in the application menu (the menu listing all running applications). The purpose of the Nag Notifier is to allow you to be reminded even when Nag is not running. Since the Nag Notifier is installed in the Extensions folder inside the System Folder, it is always running and can launch Nag to remind you when necessary. The Nag Notifier uses the absolute minimum processor time necessary so you don't have to worry that it will degrade the performance of other applications.
Latest Version: 3.0
Email: Chaotic@kagi.com

Natural Order 
Natural Order is a System Extension that improves the sorting order that your Macintosh uses when it displays lists of items that have numbers in the name. This has been a problem in instances where files are numbered 1, 2, 3,...12, 13. Without Natural Order, they would appear in this order: 1, 10, 11, 12, 13, 2, 3.... Natural order fixes this problem. Recommended. 
Latest Version: 1.4

Navigation
Part of Navigation Services. Provides applications with updated dialogs for opening, saving and choosing files.
Latest Version: 1.0

NecCDDrvr
This extension allows your Mac to mount and read CD-ROMs using a NEC CD-ROM drive.
Latest Version: n/a

Net-Print
Allows you to highlight text (in any application) and print it or save it. Also lets you take multiple chunks of text and print them on the same sheet of paper or save them in the same file. Net-Print is especially useful on the Internet for those long web pages with one useful piece of information. Net-Print can print all of the information for documenting your source(URL, title, and date). Net-Print can also quickly print labels for Zip disks. 
Latest Version: 8.1
Email: johnmoe@kagi.com
URL: http://www93.pair.com/johnmoe/

NetBIOS
Driver that uses TCP/IP to communicate on a network. NetBIOS is a network layer that provides a common and transparent way for applications and services to communicate. NetBIOS stands for “Network Basic I/O System”. NetBIOS on PCs and Windows systems works with many different types of networks. This extension keeps applications from having to know how to communicate with each new type of network protocol. NetBIOS provides a number of services to applications. Applications use NetBIOS names to identify their services to the network or to locate services they need to use. NetBIOS provides applications with connection-oriented and connectionless services. Users and Systems Administrators can customize network settings by accessing the NetBIOS Control Panel. 
Latest Version: 2.0

NetFaxPrint
Part of PSI FAX software. This Chooser extension images and converts any printed document to fax format.
Latest Version: 2.2.3

NetManage WinSock Lib
This shared library provides a single network API common, Windows Winsock networking stack to your Macintosh making it easier to port TCP/IP applications to the Mac OS environment. This allows software developers to deploy cross platform networking applications without rewriting the networking code for the Macintosh.
Latest Version: 3.5.1
URL: http://www.altura.com/

Netscape Defrost
This system extension keeps Netscape from freezing while accessing Web pages. Many people have reported freezes which require the Cmd-Opt-Esc key combination to force quit Netscape. The extension has helped just about every Macintosh and works with Netscape Navigator v2.0. In other word, more surfing, less crashing.
Latest Version: 1.0

Netscape GSM Codec
Netscape GSM Codec is an audio compressor/decompressor (codec) that allows you to communicate with other versions of CoolTalk on other platforms.
Latest Version: 1.0b1

NetSprocketLib
NetSprocket provides high-performance data transmission between players that is simple to implement, allowing you to concentrate on the information you need to communicate between players rather than on the low-level details of networking. The high-level networking functionality makes message routing transparent to the application and lets you specify best-effort or guaranteed message delivery depending on your needs. The protocol-independent model supports multiple transport protocols, such as AppleTalk, TCP/IP, and serial interfaces, based on Open Transport. The TCP/IP protocol allows game play across the Internet. NetSprocket also provides fault-tolerance—a critical component of any network game architecture. NetSprocket automatically adjusts to the disappearance of a player due to game application crashes or network failure. You can use NetSprocket’s human interface for hosting and joining games or you can develop your own, using NetSprocket as a model. Also, NetSprocket automatically keeps track as players join or leave a game, updating its routing information and informing the other players of changes to the list of game participants.
Latest Version: n/a

NetWare File Access
Allows your Mac to access Novell Netware file servers.
Latest Version: n/a

NetWare Print Access
Allows your Mac to access Novell Netware print servers.
Latest Version: n/a

Network Assistant Startup
Part of Apple's Network Administrators Toolkit. This extension controls access to workstations and to Network Assistant, and lets administrators and workstation users interact. The extension must be installed on all workstations you want to manage and on all administrator workstations. If a workstation doesn’t have a name, the Network Assistant Startup extension creates one. This name has this form: “Mac” followed by the processor type and the amount of RAM on the workstation. If another workstation on the network has the same name, the extension adds a sequence number to the name.
Latest Version: 3.5b6c2
URL:
http://swupdates.info.apple.com/cgi-bin/lister.pl?Apple_Support_Area/Apple_Software_Updates/US/Macintosh/Unsupported/Network_Assistant_3.5_beta/

Network Extension
Network Extension is a tool for selecting the type of network to which your Mac is connected, such as LocalTalk or EtherTalk. Don't discard this extension if your Mac is part of a network.
Latest Version: 7.5.5

Network Setup Extension
This is the shared library that implements a database of network configuration data. The same data is available in the AppleTalk, Modem, Infrared, Remote Access, and TCP/IP Preferences.
Latest Version: 1.0 (From Mac OS 8.5)

Network Launch Fix
Network Launch Fix is a system extension that allows you to launch application programs over a network. Network Launch Fix corrects a problem that caused some programs to quit unexpectedly or caused the computer to freeze when you attempted to open programs over the network. You should install Network Launch Fix if you have a Macintosh computer with a 68040 microprocessor connected to a network.
Latest Version: 1.0.2
URL:
http://swupdates.info.apple.com/cgi-bin/lister.pl?Apple_Support_Area/Apple_Software_Updates/US/Macintosh/Networking-Communications/Other_N-C

Niji
Niji is a cool system extension that changes your Mac's user interface. Features include custom windows, menus, pop-ups, scroll bars, buttons, icons, and more. Niji comes with several predefined appearances, such as "True NeXT" (a genuine NeXT-like interface), "Jump to Eight" (for System 7 users), "Back To Seven" (for nostalgic MacOS 8 users), "Grand Prix", "Waves", etc.
Latest Version: 1.2.1
Email: niji@dial.oleane.com
URL: http://www.netinfo.fr/objectivesw/

NoPowerOffKey
Disables the keyboard power key from being used to turn off a Macintosh.Starting with System 7.5, you can turn off power by pressing the power key, just as you turn on the Macintosh by pressing the power key. This behavior isn't appropriate for some classroom or kiosk settings.
Email: blob@apple.com

Norton AntiVirus Auto-Protect
This extension guards against viruses as soon as your computer starts up. It works like a sentry in the background, alerting you when it detects an infected file or suspects a virus. It either eliminates the virus automatically or gives you the option to repair the file on the spot. When you install Norton AntiVirus, Auto-Protect is already running. Occasionally, you may need to turn Norton Antivirus Auto-Protect off to install software or complete some other job. Note: Norton AntiVirus Auto-Protect must be installed for scheduling to work. Older versions of At Ease may conflict with Norton AntiVirus Auto-Protect on startup. Norton recommends using the latest version of At Ease (version 3.0.3) to resolve any startup issues.
Latest Version: 5.0
URL: http://www.symantec.com
DOWNLOAD VIRUS DEFINITIONS FROM SYMANTEC’S WEBSITE
Symantec AntiVirus Research Center’s website:
http://www.symantec.com/avcenter/download.html
or. for the U.S. and Canada, at this FTP site:
ftp://ftp.symantec.com/public/english_us_canada/antivirus_definitions/

Norton Backup Scheduler
Norton Backup Scheduler launches Norton Backup when it is time for a scheduled backup.
Latest Version: n/a
URL: http://www.symantec.com

Norton CrashGuard Extension
This extension, together with the Norton CrashGuard application allows you to quit an application immediately when problems arise and to recover from crashes. It gives the user the opportunity to save work from the application that crashed and from other open applications. Also maintains a log of crashes and other system-related problems.
Latest Version: 4.0 (From Norton Utilities 4.0)
URL: http://www.symantec.com

Norton FastBack Scheduler

Norton FileSaver Extension

Norton Partition Extension

Norton Shared Lib

NOVA Launcher

Now Mail Sender Server

Now Mailbox Server

Now QuickFiler Extension

Now Toolbox

npacrx_ppc.Lib

NSM Toolbox

NTS PPP Extension

NU Fixer

NuDragLib.slb

NuisanceNullifer for Navigator