Maybe look like this:
(vlax-invoke shell 'run "rundll32.exe kernel32.dll Sleep 1000")
(vlax-invoke shell 'run "rundll32.exe user32.dll MessageBoxA 0 \"aaa\" \"bbb\" 0")
but it wouldn't work.
look at here
Wow !...nice reference you have. thanks for sharing.
i'll keep your link.