AutoHotkey Community

Loop
{
    Sleep, 100
    MouseGetPos, , , WhichWindow, WhichControl
    ControlGetPos, x, y, w, h, %WhichControl%, ahk_id %WhichWindow%
    ToolTip, %WhichControl%`nX%X%`tY%Y%`nW%W%`t%H%
}

Gui, +LastFound
Gui, Margin, 50, 50
Gui, Add, Button, hwndbtn1, Button1
Gui, Add, Button, hwndbtn2 x+50, Button2
Gui, Show,, Test
GuiHWND := WinExist()
Delay = 850

VarSetCapacity( HoverTime, 16, 0 )
NumPut( 16, HoverTime, 0, "UINT" )
NumPut( Delay, HoverTime, 12, "UINT" )

OnMessage(0x2A1, "WM_MOUSEHOVER")
OnMessage(0x200, "WM_MOUSEMOVE")
return

GuiClose:
Exitapp

WM_MOUSEHOVER(wparam, lparam, msg, hwnd)
{
   Global
   If ( A_GuiControl )
      Tooltip, You are hovering the mouse over %A_GuiControl%
   Else If ( previoushwnd = GuiHWND )
      Tooltip, You are hovering the mouse over the gui's client-area
   TooltipTime := A_TickCount + Delay
}

WM_MOUSEMOVE(wparam, lparam, msg, hwnd)
{
   Global HoverTime, previoushwnd, TooltipTime
   If ( A_TickCount > TooltipTime )
   {
      Tooltip,
      TooltipTime := 0x7FFFFFFFFFFFFFFF
      Reset = 1
   }
   If ( hwnd = previoushwnd ) && !Reset
      return
   NumPut( 0x80000000, HoverTime, 4, "UINT" )
   DllCall("TrackMouseEvent", UInt, &HoverTime )
   NumPut( 1, HoverTime, 4, "UINT" )
   NumPut( previoushwnd := hwnd, HoverTime, 8, "UINT" )
   DllCall("TrackMouseEvent", UInt, &HoverTime )
}