Opening Word from powerpoint with VBA

I have a word doc i would like to open & modify based on some control text boxes in a powerpoint PPT file.

I have code that works if I am already in the word doc....

Dim rngStory As Range

For Each rngStory In ActiveDocument.StoryRanges

With rngStory.Find
.Text = "Question"
.Replacement.Text = Question
.MatchCase = True
.MatchWholeWord = True
.Wrap = wdFindContinue
.Execute Replace:=wdReplaceAll
End With
Next rngStory


but dont know how to start the process.... any help????