[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'System' (#rtl)

# Reference for unit 'System'

The system unit

## Overview

The system unit contains the standard supported functions of Free Pascal. It is the same for all platforms. Basically it is the same as the system unit provided with Borland or Turbo Pascal.

Functions are listed in alphabetical order. Arguments of functions or procedures that are optional are put between square brackets.

The predefined constants and variables are listed in the first section. The second section contains an overview of all functions, grouped by functionality, and the last section contains the supported functions and procedures.

## Related topics

`UnicodeSupport` |  | Unicode and codepage support
`MiscellaneousFunctions` |  | Miscellaneous functions
`OSfunctions` |  | Operating System functions
`StringFunctions` |  | String handling
`MathematicalFunctions` |  | Mathematical routines
`MemoryFunctions` |  | Memory management functions
`FileFunctions` |  | File handling functions
`RuntimeErrors` |  | Run-Time Error behaviour