Basic Tasks to Update Multiple Views

These are the basic tasks you'll do to inform other views of modifications:

1. Define a type of hint that describes a modification to a document.
   
   
2. When a view modifies the document, create a hint describing the modification made and pass it to UpdateAllViews.
   
   
3. Override OnUpdate to use the hint so that only the portion of the screen corresponding to the modification gets updated.

The following topics describe these tasks in more detail.