By double clicking on a Visio symbol, how can I cause an
MS Access Form, in an external db, to pop up?  Can it be
done entirely via the Format -> Behaviour Feature (only
seem to be able to link to Tables, not Forms), or will I
need to write some Visio VBA code utilizing the Object
model to accomplish this?

Thank you in advance for any feedback.

There are some examples of Visio code that use database
at :

msdn home > msdn code center > code examples > office
solutions development > microsoft visio > visio 2000 >
technical articles

executive office example
network configuration example

both provide code and forms

Consider the Developing Visio Solutions book (VBS.PDF) that
should have been on your install CDROM. Also consider John
Marshall's site at www.mvps.org/visio  that has some good
references (including David Edsons book)and Graham
Wideman's book at www.diagramantics.com.

Al Edlund