模块：
Option Explicit

Public Declare Function SetWindowLong Lib "user32.dll" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CallWindowProc Lib "user32.dll" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

Public Const WM_RBUTTONUP = &H205
Public Const WM_USER = &H400
Public Const WM_NOTIFYICON = WM_USER + 1            ' 自定义消息
Public Const WM_LBUTTONDBLCLK = &H203
Public Const GWL_WNDPROC = (-4)

' 关于气球提示的自定义消息, 2000下不产生这些消息
Public Const NIN_BALLOONSHOW = (WM_USER + &H2)      ' 当 Balloon Tips 弹出时执行
Public Const NIN_BALLOONHIDE = (WM_USER + &H3)      ' 当 Balloon Tips 消失时执行（如 SysTrayIcon 被删除），
                                                    ' 但指定的 TimeOut 时间到或鼠标点击 Balloon Tips 后的消失不发送此消息
Public Const NIN_BALLOONTIMEOUT = (WM_USER + &H4)   ' 当 Balloon Tips 的 TimeOut 时间到时执行
Public Const NIN_BALLOONUSERCLICK = (WM_USER + &H5) ' 当鼠标点击 Balloon Tips 时执行。
                                                    ' 注意:在XP下执行时 Balloon Tips 上有个关闭按钮,
                                                    ' 如果鼠标点在按钮上将接收到 NIN_BALLOONTIMEOUT 消息。

Public preWndProc As Long

' Form1 窗口入口函数
Function WindowProc(ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    ' 拦截 WM_NOTIFYICON 消息
    If msg = WM_NOTIFYICON Then
        Select Case lParam
            Case WM_RBUTTONUP
                ' 右键单击图标是运行这里的代码, 可以在这里添加弹出右键菜单的代码
            Case WM_LBUTTONDBLCLK
                Unload Form1
            Case NIN_BALLOONSHOW
                Debug.Print "显示气球提示"
            Case NIN_BALLOONHIDE
                Debug.Print "删除托盘图标"
            Case NIN_BALLOONTIMEOUT
                Debug.Print "气球提示消失"
            Case NIN_BALLOONUSERCLICK
                Debug.Print "单击气球提示"
        End Select
    End If
    WindowProc = CallWindowProc(preWndProc, hwnd, msg, wParam, lParam)
End Function


窗体
Option Explicit

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

Private Type NOTIFYICONDATA
    cbSize As Long              ' 结构大小(字节)
    hwnd As Long                ' 处理消息的窗口的句柄
    uId As Long                 ' 唯一的标识符
    uFlags As Long              ' Flags
    uCallBackMessage As Long    ' 处理消息的窗口接收的消息
    hIcon As Long               ' 托盘图标句柄
    szTip As String * 128       ' Tooltip 提示文本
    dwState As Long             ' 托盘图标状态
    dwStateMask As Long         ' 状态掩码
    szInfo As String * 256      ' 气球提示文本
    uTimeoutOrVersion As Long   ' 气球提示消失时间或版本
                                ' uTimeout - 气球提示消失时间(单位:ms, 10000 -- 30000)
                                ' uVersion - 版本(0 for V4, 3 for V5)
    szInfoTitle As String * 64  ' 气球提示标题
    dwInfoFlags As Long         ' 气球提示图标
End Type

' dwState to NOTIFYICONDATA structure
Private Const NIS_HIDDEN = &H1              ' 隐藏图标
Private Const NIS_SHAREDICON = &H2          ' 共享图标

' dwInfoFlags to NOTIFIICONDATA structure
Private Const NIIF_NONE = &H0               ' 无图标
Private Const NIIF_INFO = &H1               ' "消息"图标
Private Const NIIF_WARNING = &H2            ' "警告"图标
Private Const NIIF_ERROR = &H3              ' "错误"图标

' uFlags to NOTIFYICONDATA structure
Private Const NIF_ICON As Long = &H2
Private Const NIF_INFO As Long = &H10
Private Const NIF_MESSAGE As Long = &H1
Private Const NIF_STATE As Long = &H8
Private Const NIF_TIP As Long = &H4

' dwMessage to Shell_NotifyIcon
Private Const NIM_ADD As Long = &H0
Private Const NIM_DELETE As Long = &H2
Private Const NIM_MODIFY As Long = &H1
Private Const NIM_SETFOCUS As Long = &H3
Private Const NIM_SETVERSION As Long = &H4

Private Sub Form_Load()
    ' 向托盘区添加图标
    Dim IconData As NOTIFYICONDATA
    Dim title As String
    title = "托盘程序" & vbNullChar
    With IconData
        .cbSize = Len(IconData)
        .hwnd = Me.hwnd
        .uId = 0
        .uFlags = NIF_TIP Or NIF_ICON Or NIF_MESSAGE Or NIF_INFO Or NIF_STATE
        .uCallBackMessage = WM_NOTIFYICON
        .szTip = title
        .hIcon = Me.Icon.Handle
        .dwState = 0
        .dwStateMask = 0
        .szInfo = "这是气球提示" & vbNullChar
        .szInfoTitle = title
        .dwInfoFlags = NIIF_INFO
        .uTimeoutOrVersion = 10000
    End With
    Shell_NotifyIcon NIM_ADD, IconData
    preWndProc = SetWindowLong(Me.hwnd, GWL_WNDPROC, AddressOf WindowProc)
End Sub

Private Sub Form_Unload(Cancel As Integer)
    ' 删除托盘区图标
    Dim IconData As NOTIFYICONDATA
    With IconData
        .cbSize = Len(IconData)
        .hwnd = Me.hwnd
        .uId = 0
        .uFlags = NIF_TIP Or NIF_

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