You could also make a BAT file. That makes it easy to find errors. Of course you might not want vbNormalFocus and Pause after it is debugged.

Mac

Code:
Option Explicit
Dim Sent1 As Boolean

Private Sub cmdSend_Click()
If Not Sent1 Then
  Open "doit.bat" For Output As #1
  Print #1, "net send /Users"
  Print #1, "pause"
  Print #1, "exit"
  Close #1
  Sent1 = True
End If
Shell "Doit.bat", vbNormalFocus
End Sub