INSERISCI IL CODICE SOTTOSTANTE IN UN MODULO:
Public Type NOTIFYICONDATA
cbSize As Long
hwnd As Long
uId As Long
uFlags As Long
uCallBackMessage As Long
hIcon As Long
szTip As String * 64
End Type

'constants required by Shell_NotifyIcon API call:
Public Const NIM_ADD = &H0
Public Const NIM_MODIFY = &H1
Public Const NIM_DELETE = &H2
Public Const NIF_MESSAGE = &H1
Public Const NIF_ICON = &H2
Public Const NIF_TIP = &H4
Public Const WM_MOUSEMOVE = &H200
Public Const WM_LBUTTONDOWN = &H201 'Button down
Public Const WM_LBUTTONUP = &H202 'Button up
Public Const WM_LBUTTONDBLCLK = &H203 'Double-click
Public Const WM_RBUTTONDOWN = &H204 'Button down
Public Const WM_RBUTTONUP = &H205 'Button up
Public Const WM_RBUTTONDBLCLK = &H206 'Double-click

Public Declare Function SetForegroundWindow Lib "user32" _
(ByVal hwnd As Long) As Long
Public Declare Function Shell_NotifyIcon Lib "shell32" _
Alias "Shell_NotifyIconA" _
(ByVal dwMessage As Long, pnid As NOTIFYICONDATA) As Boolean

Public nid As NOTIFYICONDATA

INSERISCI IL CODICE SOTTOSTANTE IN UN FORM:
Private Sub Form_Load()
'the form must be fully visible before calling Shell_NotifyIcon
Me.Show
Me.Refresh
With nid
.cbSize = Len(nid)
.hwnd = Me.hwnd
.uId = vbNull
.uFlags = NIF_ICON Or NIF_TIP Or NIF_MESSAGE
.uCallBackMessage = WM_MOUSEMOVE
.hIcon = Me.Icon
.szTip = "Your ToolTip" & vbNullChar
End With
Shell_NotifyIcon NIM_ADD, nid
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X AS Single, Y As Single)
Dim Result As Long
Dim msg As Long
'the value of X will vary depending upon the scalemode setting
If Me.ScaleMode = vbPixels Then
msg = X
Else
msg = X / Screen.TwipsPerPixelX
End If
Select Case msg
Case WM_LBUTTONUP '514 restore form window
Me.WindowState = vbNormal
Result = SetForegroundWindow(Me.hwnd)
Me.Show
Case WM_LBUTTONDBLCLK '515 restore form window
Me.WindowState = vbNormal
Result = SetForegroundWindow(Me.hwnd)
Me.Show
Case WM_RBUTTONUP '517 display popup menu
Result = SetForegroundWindow(Me.hwnd)
Me.PopupMenu Me.mPopupSys
End Select
End Sub

Private Sub Form_Resize()
If Me.WindowState = vbMinimized Then Me.Hide
End Sub

Private Sub Form_Unload(Cancel As Integer)
Shell_NotifyIcon NIM_DELETE, nid
End Sub

Private Sub mPopExit_Click()
Unload Me
End Sub

Private Sub mPopRestore_Click()
Dim Result As Long
Me.WindowState = vbNormal
Result = SetForegroundWindow(Me.hwnd)
Me.Show
End Sub
LE PROPRIETA' DA GESTIRE DEL FORM
.icon = l'icona che vuoi visualizzare
.min button = true
.showintaskbar = false
INSERISCI POI QUESTI MENU NEL FORM:
Caption Name Enabled Visible Position
---------------------------------------------------------
&SysTray mPopupSys True False Main Level
&Restore mPopRestore True True Inset one
&Exit mPopExit True True Inset one
==============
Dovrebbe funzionare tutto...