Below are some links to Apple TIL documents.  Further TIL documents can be viewed by going to http://www.apple.com/support/ and entering the article number into the Search Support field.

Article 2238 How to Reset PRAM and NVRAM
Article 17392 Extensions Manager: Extensions Off
Article 22192 OS 8: Internet Applications Require Certain Extensions
Article 24138 Open Transport: How To Upgrade From Classic Networking
Article 24158 Browse the Internet and Mail Icons: Setting the Helper Applications
Article 24482 Troubleshooting slow connections
Article 24708 Modem Initialisation Strings
Article 24775 Remote Access: Using the Terminal Window to Send AT Commands
Article 24789 Troubleshooting "No Dial Tone"
Article 24793 Modem Troubleshooting: Cannot View Web Pages After Connecting
Article 24877 Stopping unwanted autodial attempts
Article 25065 Microsoft Internet Explorer: Freeze At Launch
Article 25218 iMac Modem Extension
Article 30917 Power Macintosh G3 (Blue and White): Installing Internal Modem Software
Article 30929 Extension Conflict Troubleshooting
Article 31045 PPP missing from TCP/IP options
Article 31283 OS 9 - Browser unable to download unless FTP Passive Mode is enabled
Article 31321 OS 9.1: No Sound From Internal Modem
Article 31322 USB modems not working after update to OS 9.1
Article 58161 OS 8.5: Sherlock Error Accessing Browser
Article 58168 OS 8.5: Error Opening Internet Control Panel or File Exchange
Article 60763 Type 3 or Type 10 Error May Occur if Internet Config Is Missing
Article 75085 Open Transport: TCP/IP Configuration
Article 75097 Mac OS Runtime for Java 2.2.5 Software and Information
Article 85018 Apple Modem Updater
Article 106093 Mac OS 9.x: Custom Removing Internet Access
Article 106272 Mac OS X: About Trash, Deleting Locked Files
Article 106712 Mac OS X: Troubleshooting Permissions Issues
Article 106743 Mac OS X 10.1: Additional Features of the Dock
Article 106795 Outlook Express Spell Checking Requires Microsoft Office