Use the Form property when referencing subforms in your code

There's a good post from back in May on the Microsoft office team Access blog that talks about some best practices for referring to forms and controls in code: Power Tip: Use the Form property when referencing subforms in your code. If you're serious about building applications using Access forms you should understand the concepts in the article.
The title is a little misleading. As well as talking about using subforms, it talks about using from variables to make referring to your controls easier.