Shoutbox

thanks, but in fact it is not a function activable from menu that i want to trigger. 
and meanwhile i found a module :  VB Script

' get windows "handle"
Set oWrap = CreateObject("DynamicWrapper")
oWrap.Register "USER32.DLL","FindWindowA","i=ss","f=s","r=l"
HWndWLM = oWrap.FindWindowA(vbNullString,  "Windows Live Messenger")

Const WM_COMMAND = &H111
const wParam = 40233    ' CmdId  example
const lParam = 0 '&H00000000 

oWrap.Register "USER32.DLL","PostMessageA","i=huuu","f=s","r=l"
oWrap.PostMessageA HWndWLM,WM_COMMAND,wParam,lParam

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thanks a lot