在Windows NT下，你能强制本地或远程机器定时关闭。这段代码将告诉你怎么做。你能指定系统关闭前的等待时间（0代表立即关闭），关闭进程的优先级（决定是否允许保存未完成的工作）和机器是否要重新启动。
　　开始一个新的Project，加入一个module，然后加入一下代码：

'判断系统是否为NT：
Private Type OSVERSIONINFO
　　dwOSVersionInfoSize As Long
　　dwMajorVersion As Long
　　dwMinorVersion As Long
　　dwBuildNumber As Long
　　dwPlatformId As Long
　　szCSDVersion As String * 128 ' Maintenance string for PSS usage
End Type  
Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As Long
Private Const VER_PLATFORM_WIN32_NT = 2
Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const VER_PLATFORM_WIN32s = 0

'报告API错误：
Private Const FORMAT_MESSAGE_ALLOCATE_BUFFER = &H100
Private Const FORMAT_MESSAGE_ARGUMENT_ARRAY = &H2000
Private Const FORMAT_MESSAGE_FROM_HMODULE = &H800
Private Const FORMAT_MESSAGE_FROM_STRING = &H400
Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
Private Const FORMAT_MESSAGE_IGNORE_INSERTS = &H200
Private Const FORMAT_MESSAGE_MAX_WIDTH_MASK = &HFF
Private Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, Arguments As Long) As Long

' =====================================================================
' NT Only
Private Type LARGE_INTEGER
　　LowPart As Long
　　HighPart As Long
End Type

Private Type LUID
　　LowPart As Long
　　HighPart As Long
End Type

Private Type LUID_AND_ATTRIBUTES
　　pLuid As LUID
　　Attributes As Long
End Type

Private Type TOKEN_PRIVILEGES
　　PrivilegeCount As Long  
　　Privileges(0 To 0) As LUID_AND_ATTRIBUTES  
End Type  

Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function OpenProcessToken Lib "advapi32.dll" (ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, TokenHandle As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function GetTokenInformation Lib "advapi32.dll" (ByVal TokenHandle As Long, TokenInformationClass As Integer, TokenInformation As Any, ByVal TokenInformationLength As Long, ReturnLength As Long) As Long
Private Declare Function AdjustTokenPrivileges Lib "advapi32.dll" (ByVal TokenHandle As Long, ByVal DisableAllPrivileges As Long, NewState As TOKEN_PRIVILEGES, ByVal BufferLength As Long, PreviousState As TOKEN_PRIVILEGES, ReturnLength As Long) As Long
Private Declare Function LookupPrivilegeValue Lib "advapi32.dll" Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, ByVal lpName As String, lpLuid As LUID) As Long

Private Const SE_SHUTDOWN_NAME = "SeShutdownPrivilege"
Private Const SE_PRIVILEGE_ENABLED = &H2

Private Const READ_CONTROL = &H20000
Private Const STANDARD_RIGHTS_ALL = &H1F0000
Private Const STANDARD_RIGHTS_EXECUTE = (READ_CONTROL)
Private Const STANDARD_RIGHTS_READ = (READ_CONTROL)
Private Const STANDARD_RIGHTS_REQUIRED = &HF0000
Private Const STANDARD_RIGHTS_WRITE = (READ_CONTROL)

Private Const TOKEN_ASSIGN_PRIMARY = &H1
Private Const TOKEN_DUPLICATE = (&H2)
Private Const TOKEN_IMPERSONATE = (&H4)
Private Const TOKEN_QUERY = (&H8)
Private Const TOKEN_QUERY_SOURCE = (&H10)
Private Const TOKEN_ADJUST_PRIVILEGES = (&H20)
Private Const TOKEN_ADJUST_GROUPS = (&H40)
Private Const TOKEN_ADJUST_DEFAULT = (&H80)
Private Const TOKEN_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED Or _
　　　　　　　　　　　　TOKEN_ASSIGN_PRIMARY Or _
　　　　　　　　　　　　TOKEN_DUPLICATE Or _
　　　　　　　　　　　　TOKEN_IMPERSONATE Or _
　　　　　　　　　　　　TOKEN_QUERY Or _
　　　　　　　　　　　　TOKEN_QUERY_SOURCE Or _
　　　　　　　　　　　　TOKEN_ADJUST_PRIVILEGES Or _
　　　　　　　　　　　　TOKEN_ADJUST_GROUPS Or _
　　　　　　　　　　　　TOKEN_ADJUST_DEFAULT)
Private Const TOKEN_READ = (STANDARD_RIGHTS_READ Or TOKEN_QUERY)
Private Const TOKEN_WRITE = (STANDARD_RIGHTS_WRITE Or _
　　　　　　　　　　　　TOKEN_ADJUST_PRIVILEGES Or _
　　　　　　　　　　　　TOKEN_ADJUST_GROUPS Or _
　　　　　　　　　　　　TOKEN_ADJUST_DEFAULT)
Private Const TOKEN_EXECUTE = (STANDARD_RIGHTS_EXECUTE)

Private Const TokenDefaultDacl = 6
Private Const TokenGroups = 2
Private Const TokenImpersonationLevel = 9
Private Const TokenOwner = 4
Private Const TokenPrimaryGroup = 5
Private Const TokenPrivileges = 3
Private Const TokenSource = 7
Private Const TokenStatistics = 10
Private Const TokenType = 8
Private Const TokenUser = 1

Private Declare Function InitiateSystemShutdown Lib "advapi32.dll" Alias "InitiateSystemShutdownA" (ByVal lpMachineName As String, ByVal lpMessage As String, ByVal dwTimeout As Long, ByVal bForceAppsClosed As Long, ByVal bRebootAfterShutdown As Long) As Long
Private Declare Function AbortSystemShutdown Lib "advapi32.dll" Alias "AbortSystemShutdownA" (ByVal lpMachineName As String) As Long
' ================================================================

Public Function WinError(ByVal lLastDLLError As Long) As String
Dim sBuff As String
Dim lCount As Long
　　
　　'返回与LastDLLError关联的错误消息：
　　sBuff = String$(256, 0)
　　lCount = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM Or FORMAT_MESSAGE_IGNORE_INSERTS, _  
　　　　　　　　　　　　　 0, lLastDLLError, 0&, sBuff, Len(sBuff), ByVal 0)  
　　If lCount Then  
　　　WinError = Left$(sBuff, lCount)
　　End If
　　
End Function

Public Function IsNT() As Boolean
　Static bOnce As Boolean
　Static bValue As Boolean

　　'返回系统是否为NT：
　　If Not (bOnce) Then
　　　Dim tVI As OSVERSIONINFO
　　　tVI.dwOSVersionInfoSize = Len(tVI)
　　　If (GetVersionEx(tVI) <> 0) Then
　　　　bValue = (tVI.dwPlatformId = VER_PLATFORM_WIN32_NT)
　　　　bOnce = True
　　　End If
　　End If
　　IsNT = bValue
End Function

Private Function NTEnableShutDown(ByRef sMsg As String) As Boolean
　Dim tLUID As LUID
　Dim hProcess As Long
　Dim hToken As Long
　Dim tTP As TOKEN_PRIVILEGES, tTPOld As TOKEN_PRIVILEGES
　Dim lTpOld As Long
　Dim lR As Long

　　'在NT下，我们必须给试图关闭系统的进程SE_SHUTDOWN_NAME特权
　　'否则，所有企图关闭系统的调用都会无效！

　　'寻找Shoudown特权令牌的LUID：
　　lR = LookupPrivilegeValue(vbNullString, SE_SHUTDOWN_NAME, tLUID)
　　
　　'如果我们找到了  
　　If (lR <> 0) Then
　　　　　　　　
　　'取得当前进程的句柄：
　　hProcess = GetCurrentProcess()
　　If (hProcess <> 0) Then
　　　　'打开令牌来Adjust和Query（用户可能没有权限）
　　　　lR = OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, hToken)
　　　　If (lR <> 0) Then
　　　　　　　　　　
　　　　　　'好，我们现在可以调整Shutdown特权了：
　　　　　　With tTP
　　　　　　　　.PrivilegeCount = 1
　　　　　　　　With .Privileges(0)
　　　　　　　　.Attributes = SE_PRIVILEGE_ENABLED
　　　　　　　　.pLuid.HighPart = tLUID.HighPart
　　　　　　　　.pLuid.LowPart = tLUID.LowPart
　　　　　　　　End With
　　　　　　End With
　　　　　　
　　　　　　'现在允许这个进程关闭系统：
　　　　　　lR = AdjustTokenPrivileges(hToken, 0, tTP, Len(tTP), tTPOld, lTpOld)
　　　　　　
　　　　　　If (lR <> 0) Then
　　　　　　　　NTEnableShutDown = True
　　　　　　Else
　　　　　　　　Err.Raise eeSSDErrorBase + 6, App.EXEName & ".mShutDown", "不能shutdown：你没有关闭本系统的权限。[" & WinError(Err.LastDllError) & "]"
　　　　　　End If
　　　　　　
　　　　　　'记得用完后关闭这个句柄：
　　　　　　CloseHandle hToken
　　　　Else
　　　　　　Err.Raise eeSSDErrorBase + 6, App.EXEName & ".mShutDown", "不能shutdown：你没有关闭本系统的权限。[" & WinError(Err.LastDllError) & "]"
　　　　End If
　　Else
　　　　Err.Raise eeSSDErrorBase + 5, App.EXEName & ".mShutDown", "不能shutdown：不能终止当前进程。[" & WinError(Err.LastDllError) & "]"
　　End If
　　Else
　　Err.Raise eeSSDErrorBase + 4, App.EXEName & ".mShutDown", "不能shutdown：找不到SE_SHUTDOWN_NAME特权值。[" & WinError(Err.LastDllError) & "]"
　　End If

End Function


Public Function NTForceTimedShutdown( _
　　Optional ByVal lTimeOut As Long = -1, _
　　Optional ByVal sMsg As String = "", _
　　Optional ByVal sMachineNetworkName As String = vbNullString, _
　　Optional ByVal bForceAppsToClose As Boolean = False, _
　　Optional ByVal bReboot As Boolean = False _
　　) As Boolean
　Dim lR As Long
　　
　　If IsNT Then
　　'如果我们在NT下，确信我们已经给了这个进程关闭系统的特权：
　　If Not (NTEnableShutDown(sMsg)) Then
　　　　Exit Function
　　End If
　　
　　'这是定时关闭系统的代码：
　　lR = InitiateSystemShutdown(sMachineNetworkName, sMsg, lTimeOut, bForceAppsToClose, bReboot)
　　If (lR = 0) Then
　　　　Err.Raise eeSSDErrorBase + 2, App.EXEName & ".mShutDown", "InitiateSystemShutdown failed: " & WinError(Err.LastDllError)
　　End If

　　Else
　　Err.Raise eeSSDErrorBase + 1, App.EXEName & ".mShutDown", "函数仅在Windows NT下有效。"
　　End If
End Function


Public Function NTAbortTimedShutdown(Optional ByVal sMachineNetworkName As String = vbNullString)  
　AbortSystemShutdown sMachineNetworkName  
End Function  


　　为了试验一次shutdown，在窗体上放两个Command按钮和一个Text，然后粘贴一下代码。注意，你必须在运行前保存你的工作，因为Shutdown也将关闭VB且不会给你任何有关保存的询问！
　　点击Command1，它根据Text里的值开始一次定时关机。要终止Shutdown，点Command2。

Private Sub Command1_Click()
　　If (MsgBox("你确定要强制定时关机吗？", vbYesNo Or vbQuestion) = vbYes) Then
　　NTForceTimedShutdown CLng(Text1.Text), "系统将在" & Text1.Text & "秒后关闭..."
End If
End Sub

Private Sub Command2_Click()
NTAbortTimedShutdown
End Sub

Private Sub Form_Load()
Text1.Text = 60
End Sub