> # Environment-Specific Information

> This book supports users of various operating environments. Where it provides information that does not apply to all supported environments, the following symbols are used to identify that information.

> Symbol | Environment
> --- | ---
> | Windows. Information specific to the Microsoft Windows 2000, Windows Server 2003, Windows XP, and Windows Vista environments is identified by the Windows symbol.
> | Linux and UNIX. Information specific to Linux and UNIX 32-bit and 64-bit environments is identified by this symbol, which applies to all supported Linux and UNIX environments. UNIX is a registered trademark of The Open Group in the United States and other countries.
> | z/OS. Information specific to z/OS environments is identified by the characters z/OS.