These topics discuss text and file I/O and summarize standard library routines. Many of the procedures and functions listed here are defined in the System and Syslnit units, which are implicitly used with every application. Others are built into the compiler but are treated as if they were in the System unit.
Some standard routines are in units such as SysUtils, which must be listed in a uses clause to make them available in programs. You cannot, however, list System in a uses clause, nor should you modify the System unit or try to rebuild it explicitly.
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