Table of Contents

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0.   Preamble
0.1. Changes
0.2. Notice and Disclaimer
0.3. Where to get this document
0.4. How to contribute to this document?
0.5. Can I email the author my questions?
0.6. What's up with posting to comp.infosystems.www.authoring.cgi?
0.7. Credits

1.   Basic Questions
1.1. What is CGI?
1.2. Is it a script or a program?
1.3. When do I need to use CGI?
1.4. Should I use CGI or JAVA?
1.5. Should I use CGI or SSI?
1.6. Should I use CGI or an API?
1.7. What do I absolutely need to know?
1.8. Does CGI create new security risks?
1.9. Do I need to be on Unix?
1.10. Do I have to use Perl?
1.11. Do I have to put it in cgi-bin?
1.12. Do I have to call it *.cgi?  *.pl?
1.13. What is CGIWrap, and how does it affect my program?

2.   HTTP Headers and NPH Scripts
2.1. What is HTTP (HyperText Transfer Protocol)?
2.2. What HTTP request headers can I use?
2.3. What Environment variables are available to my application?
2.4. What HTTP response headers do I need to know about?
2.5. What is NPH?
2.6. Must/should/can I write nph scripts?
2.7. Do I have to call it nph-*
2.8. What is the difference between GET and POST?

3.   Techniques: "How do I..."
3.1. Can I get information about who is visiting?
3.2. Can I get the email of visitors?
3.3. 	"But I saw some.kool.site display my email address..."
3.4. Can I get browser details and return different pages?
3.5. Can I trace where a user has come from/is going to?
3.6. Can I launch a long process and return a page before it's finished?
3.7. Can I launch a long process which the user interacts with?
3.8. Can I password-protect my pages?
3.9. Can I do HTTP authentication using CGI?
3.10. Can I identify users/sessions without password protection?
3.11. Can I redirect users to another page?
3.12. Can I run a CGI script without returning a new page to the browser?
3.13. Can I write output to a different Netscape frame?
3.14. Can I write output to several frames at once?
3.15. Can I use a CGI script to generate both text and inline images?
3.16. How can I use Caches to make CGI scripts faster and more Net-friendly?

4.   Applications: Is there an existing script to ...
4.1. Where to look for free scripts for my application?
4.2. Discussion group/bulletin board
4.3. CSCW/Groupware
4.4. Database

5.   Troubleshooting a CGI application
5.1. Are there some interactive debugging tools and services available?
5.2. I'm having trouble with my headers.   What can I do?

6.   Further Reading
6.1. Other FAQs/collections (including online book)
6.2. Reference Pages

INDEX