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I have a situation where some data fields from Module A need to be accessed from Module B. How can this be done?

Also, If the a value in module A changes (user selects a new value from a dropped down control), can Module B get notified to refreshed itself based on the newly selected value?

Ahmed,

There are several ways to do this.  

A classic webforms example, which as been in DNN for years, is implementing the IModuleCommunicator interface of DotNetNuke.Entities.Modules.Communications.  Here is an article that explains it.  

A more modern approach would be to implement an observer pattern in javascript.  For example, you could have a common js library that both modules reference.  Module B could use a common function to register a callback function (event) and Module A could call a function that would therefore call the callback function from Module B.  This is like a Pub/Sub architecture.  Here is an example of how to do in jquery.