Option Explicit

Const MAX_TOOLTIP As Integer = 64
Const NIF_ICON = &H2
Const NIF_MESSAGE = &H1
Const NIF_TIP = &H4
Const NIM_ADD = &H0
Const NIM_DELETE = &H2
Const WM_MOUSEMOVE = &H200
Const WM_LBUTTONDOWN = &H201
Const WM_LBUTTONUP = &H202
Const WM_LBUTTONDBLCLK = &H203
Const WM_RBUTTONDOWN = &H204
Const WM_RBUTTONUP = &H205
Const WM_RBUTTONDBLCLK = &H206

Private Type NOTIFYICONDATA
cbSize As Long
hwnd As Long
uID As Long
uFlags As Long
uCallbackMessage As Long
hIcon As Long
szTip As String * MAX_TOOLTIP
End Type
Private nfIconData As NOTIFYICONDATA

Private Declare Function Shell_NotifyIcon Lib "shell32.dll" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, lpData As NOTIFYICONDATA) As Long

Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long

'***App Window Constants***
Private Const WIN_NORMAL = 1 'Open Normal
Private Const WIN_MAX = 3 'Open Maximized
Private Const WIN_MIN = 2 'Open Minimized

Private Declare Function apiShellExecute Lib "shell32.dll" _
Alias "ShellExecuteA" _
(ByVal hwnd As Long, _
ByVal lpOperation As String, _
ByVal lpFile As String, _
ByVal lpParameters As String, _
ByVal lpDirectory As String, _
ByVal nShowCmd As Long) _
As Long

'***Error Codes***
Private Const ERROR_SUCCESS = 32&
Private Const ERROR_NO_ASSOC = 31&
Private Const ERROR_OUT_OF_MEM = 0&
Private Const ERROR_FILE_NOT_FOUND = 2&
Private Const ERROR_PATH_NOT_FOUND = 3&
Private Const ERROR_BAD_FORMAT = 11&

Private Sub AddIcon()
'
' Add this application's icon to the system tray.
'
' Parm 1 = Handle of the window to receive notification messages
' associated with an icon in the taskbar status area.
' Parm 2 = Icon to display.
' Parm 3 = Handle of icon to display.
' Parm 4 = Tooltip displayed when cursor moves over system tray icon.
'
With nfIconData
.hwnd = Me.hwnd
.uID = Me.Icon
.uFlags = NIF_ICON Or NIF_MESSAGE Or NIF_TIP
.uCallbackMessage = WM_MOUSEMOVE
.hIcon = Me.Icon.Handle
.szTip = "Projects/Application" & vbNullChar
.cbSize = Len(nfIconData)
End With
Call Shell_NotifyIcon(NIM_ADD, nfIconData)
End Sub

Private Sub cmdQuit_Click()
Unload Me
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim lMsg As Single
'
' Determine the event that happened to the System Tray icon.
' Left clicking the icon displays a message box.
' Right clicking the icon creates an instance of an object from an
' ActiveX Code component then invokes a method to display a message.
'
lMsg = X / Screen.TwipsPerPixelX
Select Case lMsg
Case WM_LBUTTONUP
mnu_options.Visible = False
Case WM_RBUTTONUP

Case WM_MOUSEMOVE

Case WM_LBUTTONDOWN
mnu_options.Visible = False
Case WM_LBUTTONDBLCLK
Me.WindowState = vbNormal
Me.Show
Case WM_RBUTTONDOWN
mnu_options.Visible = True
SetForegroundWindow Me.hwnd
PopupMenu mnu_options, , , , ss 'will be shown in bold
Case WM_RBUTTONDBLCLK
'whichever exe you may want to call
Case Else
mnu_options.Visible = False
End Select
End Sub

Private Sub Form_Resize()

If Me.WindowState = vbMinimized Then
AddIcon
Me.Hide
End If
End Sub