End Task through code

Is there a way through code to end a specific task that would show up when you hit Alt-Tab
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Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hwnd As Long) As Long
Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
'Declare constants used by GetWindow.
Global Const GW_CHILD = 5
Global Const GW_HWNDFIRST = 0
Global Const GW_HWNDLAST = 1
Global Const GW_HWNDNEXT = 2
Global Const GW_HWNDPREV = 3
Global Const GW_OWNER = 4

 Dim CurrWnd As Long
 Dim Length As Long
 Dim ListItem As String
 Dim s As String
 Dim Handle As Long
 Const NILL = 0&
 Const WM_SYSCOMMAND = &H112
 Const SC_CLOSE = &HF060&
 CurrWnd = GetWindow(frmBanner.hwnd, GW_HWNDFIRST)
 While CurrWnd <> 0
  Length = GetWindowTextLength(CurrWnd)
  ListItem = Space(Length + 1)
  Length = GetWindowText(CurrWnd, ListItem, Length + 1)
  If Length > 0 Then
   If InStr(LCase(ListItem), "Explorer") <> 0 Then
    '* Post a message to the bad program to end its existence.
    Handle = SendMessage(CurrWnd, WM_SYSCOMMAND, SC_CLOSE, NILL)
   End If
  End If
  CurrWnd = GetWindow(CurrWnd, GW_HWNDNEXT)

Be careful of line wrapping in the declares...
The above code will get a task list and shows how to kill the Explorer, though I wouldn't really recommend it...  I actually use it to kill various other programs.  The While Wend loop will return a whole bunch of tasks that are running.  As far as I can tell, you'll get all the same tasks as if you hit Ctrl-Alt-Del, plus a bunch of internal Windows stuff.
I think I got all the constants and declares, but if any are missing, please let me know.  I just grabbed this from the source of a program I am writing, but I hope I got everything.
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