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# Index: I

identifying clients: 2.5.1. Identifying Clients
identifying users, script for: 3.4.2. User Authentication and Identification
identity encoding: 2.6.3. Encoding
if block (CGI script), describing actions of: 10.4.2.2. Address book CGI script
if, elif command: 6.2.2. Format
image buttons: 4.2.3.8. Image buttons
  supporting as submit buttons: 5.2.2.4. Supporting image buttons as submit buttons
image formats (new and uncommon), browser specification of: 2.6.1. Media Type
image_fetch.cgi script (example): 3.4.1. Check the Client Browser
image/jpeg content type: 2.6.1. Media Type
  13.5.4. Image Processing
Image::Magick module: 13.5. PerlMagick
  image file formats, working with
    PDF and PostScript: 13.5.3. PDF and PostScript Support
  image processing with: 13.5.4. Image Processing
  ImageMagick library
    installation: 13.5.1. Installation
    operations supported by: 13.5. PerlMagick
  LZW compression, enabling: 13.5.1.2. Enabling LZW compression
  requirements for use: 13.5.1.1. Requirements
images
  data, outputting: 13.2. Outputting Image Data
    dynamic images outputting: 13.2.2. Including Dynamic Images in HTML
    random images, CGI script returning: 13.2.1. An Example
  file formats: 13.1. File Formats
    GIF: 13.1.1. GIF
    Image::Magick module, working with: 13.5.1.2. Enabling LZW compression
    JPEG: 13.1.3. JPEG
    PDF: 13.1.4. PDF
    PNG: 13.1.1.1. The LZW patent
    PostScript, Image::Magick and: 13.5.3. PDF and PostScript Support
  hijacking of, restricting (CGI script): 3.4.3. Restricting Image Hijacking
  Image::Magick module, processing with: 13.5.4. Image Processing
include command: 6.2.2. Format
  6.2.6. Executing CGI Programs
  6.3.1.3. Including other files
increments for image file printing, determining: 3.4.1. Check the Client Browser
indentation
  coding style guide, covering in: 16.2. Coding Guidelines
  HTML here documents: 5.4.2. Here Documents
    unindent subroutine: 5.4.2. Here Documents
index queries: 5.2.2.3. Index queries
INDEX_DB constant: 12.3.1. Search Application
indexes: 2.1.1. Elements of a URL
  2.1.1. Elements of a URL
  (see also query strings)
  -cache option: 12.3. Inverted Index Search
  CGI application to search: 12.3.1. Search Application
  current column and row, using as array indices: 6.4.3.1. Tables
  directory, specifying for files to be indexed: 12.3. Inverted Index Search
  file, binding with %index hash: 12.3.1. Search Application
  inverted index search: 12.3. Inverted Index Search
    lowercase (case-insensitive), specifying: 12.3. Inverted Index Search
    stripping HTML tags from material: 12.3. Inverted Index Search
  numbers, skipping: 12.3. Inverted Index Search
  stop words, specifying file containing: 12.3. Inverted Index Search
  word suffixes, removing: 12.3. Inverted Index Search
  words, checking for previous occurrence of: 12.3. Inverted Index Search
index.html
  getting full path with PATH_TRANSLATED variable: 11.1. Query Strings and Extra Path Information
information servers: 7.3. Data Exchange
input
  handling with CGI.pm module: 5.2. Handling Input with CGI.pm
  from users
    removing taint from: 8.4.3. How Taintedness Is Removed
    security and: 8.2. Handling User Input
    shell and: 8.2.2. User Input and the Shell
    tainted data, checking for: 8.4.1. How Taint Works
input elements (forms), Embperl creation of: 6.4.3.3. Form input elements
input, forms
  decoding: 4.3. Decoding Form Input
input record separator (default), Perl: 12.3. Inverted Index Search
input validation, forms: 7.2.1. Input Validation
  CGI script, re-validating client data with: 7.2.1.4. Validating twice
  example: 7.2.1.3. Validation example
    formLib.js file: 7.2.1.3. Validation example
    input_validation.html file: 7.2.1.3. Validation example
  submits: 7.2.1.2. Validating submits
  validating elements: 7.2.1.1. Validating elements
inserting data into databases: 10.3.2. Inserting Data
installation
  Apache server, default paths: 1.4. Web Server Configuration
  FastCGI: 17.2.1. Installing FastCGI
  GD module: 13.3.1. Installation
  GD::Graph3d, documentation and additional graph types: 13.4.3. GD::Graph3D
  ImageMagick library: 13.5.1. Installation
  mod_perl: 17.3.1. Installation and Configuration
  modules, CPAN: B.1.1. Installing Modules
interactive debuggers: 15.3. Debugging Tools
  Perl, invoking with -d flag: 15.3.5.1. The Perl debugger
interface for outputting HTML, CGI.pm module: 5.1.2. The Kitchen Sink
internal redirect: 3.3.1.2. Forwarding to another URL
internationalization: 2.6.2. Internationalization
Internet email: 11.2. Hidden Fields
  (see also email)
  sending with Perl mailers: 9.6. Perl Mailers
  sendmail, use of: 9.4. sendmail
  similarity to HTTP message formats: 2.2.2. HTTP Headers
  structure of: 9.3. Structure of Internet Email
Internet, history of: 1.1. History
Internet Protocol (see IP)
interpreters
  delays in executing Perl CGI applications: 17. Efficiency and Optimization
  multiple, referencing correct: 15.1.2. The Pound-Bang
  perl interpreter, embedding inside web server: 1.3.2. Alternatives to CGI
  pound-bang (#!) line and: 15.1.2. The Pound-Bang
interprocess communication (IPC).: 14.1. Communicating with Other Servers
invalid HTTP content type headers: 15.1.4. "Malformed" Header
inverted index: 12.3. Inverted Index Search
invoking CGI scripts: 1.2.2. Invoking CGI Scripts
IO::File module: 10.1.3.1. Anonymous temporary files
IO::Socket module: 14.1.2. IO::Socket
IP (Internet Protocol)
  addresses
    hosts, identifying: 2.1.1. Elements of a URL
    hosts, identifying socket in: 14.1.1. Sockets
    multiple domain names mapped to single: 2.3.2.1. Host
    remote host, obtaining from environment variables: 1.2.1. Sample CGI
  information, displaying with SSI: 6.2.3. Environment Variables
iPlanet Enterprise Server, buffering output: 3.1.1.2. STDOUT
  3.3.2. Complete (Non-Parsed) Headers
ISO Latin 1 character set, URL encoding: 2.1.3. URL Encoding

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