VB Code:
  1. Public Declare Function ShellExecute 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

Linking a label example:

VB Code:
  1. Private Sub Label1_Click()
  2. ShellExecute Me.hwnd, "OPEN", "http://www.vbforums.com", vbNullString, vbNullString, 5
  3. End Sub