Visual Basic - Captura de Pantalla

Alguien sabe como Hacer una captura de pantalla en Visual Basic, no de la pantalla del programa, sino de la pantalla en si, es decir, como se activa la funcion de la tecla imprimir pantalla...

hola!
prueba usando la instruc. sendkeys
chao!

Tienes que usar API

Option Explicit

Private Declare Function MapVirtualKey Lib "user32" _
Alias "MapVirtualKeyA" (ByVal wCode As Long, _
ByVal wMapType As Long) As Long

Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, _
ByVal bScan As Byte, ByVal dwFlags As Long, _
ByVal dwExtraInfo As Long)
Private Const VK_MENU = &H12
Private Const VK_SNAPSHOT = &H2C
Private Const KEYEVENTF_KEYUP = &H2

Public Sub CapturaPantalla()
' Press Alt.
keybd_event VK_MENU, 0, 0, 0
DoEvents

' Press Print Scrn.
keybd_event VK_SNAPSHOT, 1, 0, 0
DoEvents

' Release Alt.
keybd_event VK_MENU, 0, KEYEVENTF_KEYUP, 0
DoEvents

End Sub

GRACIAS!