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A number of symbols are predefined by the compiler with a set of attributes
that describe a particular calling convention.  These symbols can be used as
aliases.  The following is a list of these symbols.

__cdecl
     __cdecl or  cdecl defines the calling convention used by Microsoft
    compilers.

__pascal
     __pascal or  pascal defines the calling convention used by OS/2 1.x and
    Windows 3.x API functions.

__stdcall
     __stdcall or  stdcall defines a special calling convention used by the
    Win32 API functions.

__syscall
     __syscall or  syscall defines the calling convention used by the 32-bit
    OS/2 API functions.

__system
     __system or  system are identical to __syscall.

The following describes the attributes of the above alias names.