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### About this guide

This document describes all constants, types, variables, functions and procedures as they are declared in the units that come standard with Free Pascal.

Throughout this document, we will refer to functions, types and variables with typewriter font. Functions and procedures gave their own subsections, and for each function or procedure we have the following topics:

Declaration
  The exact declaration of the function.
Description
  What does the procedure exactly do ?
Errors
  What errors can occur.
See Also
  Cross references to other related functions/commands.

The cross-references come in two flavors:

- References to other functions in this manual. In the printed copy, a number will appear after this reference. It refers to the page where this function is explained. In the on-line help pages, this is a hyperlink, on which you can click to jump to the declaration.
- References to Unix manual pages. (For Linux related things only) they are printed in typewriter font, and the number after it is the Unix manual section.

The chapters are ordered alphabetically. The functions and procedures in most cases also, but don’t count on it. Use the table of contents for quick lookup.

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