Running command lines from PPT without warnings

[Dave Ag]

Hello,

Following on from the thread "Avoiding password requests when
hyperlinking..." (6/6/06), it appears that the following Command Line can
successfully open a "modify password" protected presentation in slide-show
mode, without prompting for the password:

"C:\Program Files\Microsoft Office\OFFICE11\POWERPNT.EXE" /s
"C:\Presentations\main.ppt"

But I was hoping there's a way to do a similar thing from within another
PowerPoint presentation, without a warning dialogue appearing?

All tips / workarounds gratefully received!

Many thanks,
Dave