PrintInBackground Property

Microsoft PowerPoint Visual Basic

Determines whether the specified presentation is printed in the background. Read/write MsoTriState.

MsoTriState can be one of these MsoTriState constants.
msoCTrue
msoFalse
msoTriStateMixed
msoTriStateToggle
msoTrue Default. The specified presentation is printed in the background, which means that you can continue to work while it's being printed.

Example

This example prints the active presentation in the background.

With ActivePresentation
    .PrintOptions.PrintInBackground = msoTrue
    .PrintOut
End With