If you have trouble with the Video, you may need to download Codecs from TechSmith

http://download.techsmith.com/tscc/tscc.exe

Modular Rules 

1. 
   
2. Create a rule on an hidden Field in InfoPath
   
3. Set Fields,Query a DataConnection
   
4. from anywhere you would like to use this rule set the Hidden Field to now()

VSTO - shows how to develop InfoPath in Visual Studio

1. 
   
2. Open InfoPath Forms in Visual Studio
   
3. Create a rule the same way you would in InfoPath Designer
   
4. Open the Manifest.xml in the XML Editor and cut and paste the rule to set multiple fields quickly

http://k2underground.com/files/folders/videos/entry26245.aspx