Help Exec?

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Mr Pick, you were right: api_User32.decls.
But <sigh> this does absolutely nothing:
; api_WinHelp% (hwnd%, lpHelpFile$, wCommand%, dwData%) : "WinHelpA"
Include "blitzsys.bb"
sAppName$ = "TestHelp"
hwnd = DLLFindBlitzRuntimeHwnd(sAppName$) 
Print hwnd
m$ = CurrentDir$()+"help.chm"+Chr$(0)
Print m$
val = api_WinHelp(hwnd, m$, 0,0)
Print val
WaitKey
End

Unless anyone can work out the params, I'm tired of this - it's back to F1 and ExecFile().