Need to advance through side-by-side PPT files with single button

[JT Santa Fe]

Hope someone can help.
While reviewing and editting, I need to advance through side-by-side PPT
files synchronously with a single button control. I have tried code in PPT
and also in an MsAccess forms. After both files are finally editted and
finalized, they are then used in presentation mode on two separate computers
and screens.
Thanks
JT