Many miscellaneous functions come with the standard Win32 extension. These functions include some important and quite-often-overlooked necessities.
Even though all these functions are accessed through the Win32 namespace, such as
not all of them are part of the Win32 extension. Some of these functions (such as the DomainName() function) are built into Win32 Perl directly. Therefore, you can call these functions as you would a normal built-in Perl function: without loading any extension. Regardless of whether you are calling a built-in function or calling a Win32 extension-specific function, you must still specify the Win32 namespace.
Win32 Perl has built-in functions ...