各位大哥帮帮忙啊！程序题C++

Win2000&WinNT实现的代码
HANDLE hToken;
TOKEN_PRIVILEGES tkp;
if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY, &hToken))
{
LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &tkp.Privileges[0].Luid);
tkp.PrivilegeCount = 1;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, (PTOKEN_PRIVILEGES)NULL, 0);
ExitWindowsEx(EWX_SHUTDOWN|EWX_POWEROFF, 0);
}
//Win9x实现的代码
ExitWindowsEx(EWX_SHUTDOWN|EWX_POWEROFF, 0);

是什么意思呢 ！谢了！

ExitWindowsEx(EWX_SHUTDOWN|EWX_POWEROFF, 0);
关机啊