Returns a Slide object that represents the slide with the specified slide ID number. Each slide is automatically assigned a unique slide ID number when it's created. Use the SlideID property to return a slide's ID number.
expression.FindBySlideID(SlideID)
expression Required. An expression that returns a Slides collection.
SlideID Required Long. Specifies the ID number of the slide you want to return. PowerPoint assigns this number when the slide is created.
Remarks
Unlike the SlideIndex property, the SlideID property of a Slide object won't change when you add slides to the presentation or rearrange the slides in the presentation. Therefore, using the FindBySlideID method with the slide ID number can be a more reliable way to return a specific Slide object from a Slides collection than using the Item method with the slide's index number.
Example
This example demonstrates how to retrieve the unique ID number for a Slide object and then use this number to return that Slide object from the Slides collection.
Set gslides = ActivePresentation.Slides
'Get slide ID
graphSlideID = gslides.Add(2, ppLayoutChart).SlideID
gslides.FindBySlideID(graphSlideID) _
.SlideShowTransition.EntryEffect = _
ppEffectCoverLeft 'Use ID to return specific slide