VBCE 6.0 does not support MODAL forms.  You can simulate this however with a simple API call and setting the original form to disabled.  This is the same functionality can be achieved with the VBCEMisc Control.

Place the following code in a MODULE:

Option Explicit

'Constants for topmost.
Public Const HWND_TOPMOST = -1
Public Const HWND_NOTOPMOST = -2
Public Const SWP_NOMOVE = &H2
Public Const SWP_NOSIZE = &H1
Public Const SWP_NOACTIVATE = &H10
Public Const SWP_SHOWWINDOW = &H40

Declare Function SetWindowPos Lib "Coredll" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long

On Form1, place a command button and enter the following code in the click event:

Private Sub Command1_Click()
     Form1.Enabled = False
     Form2.Show
End Sub

On Form2, place a command button and enter the following code in the click event:

Private Sub Command1_Click()
     Form1.Enabled = True
     Me.Hide
End Sub

Private Sub Form_Load()
     '-- Makes this form "Always on Top..."
     '-- Does not make it modal....
     Call SetWindowPos(Me.hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE Or SWP_NOSIZE)
End Sub