Private Declare Function ShellExecute Lib "shell32.dll" _
    Alias "ShellExecuteA" (ByVal hWnd As Long, _
    ByVal lOperation As String, _
    ByVal lpFile As String, _
    ByVal lpParameters As String, _
    ByVal lpDirectory As String, _
    ByVal nShowCmd As Long) As Long
 
Private Sub Command1_Click()
  ShellExecute Me.hWnd, "print", "C:\DeinePDFDatei.pdf", vbNullString, _
    vbNullString, vbNormalFocus
End Sub