I have developed a sharepoint Web Part application in visual studio using VB.net as code behind.  I've created 3 shared web parts, 2 consumers and one provider.  One of the consumer webparts is a visual webpart and the other is not visual.  The problem occurs when I run the application and add data to the provider web part to display a gridview in the consumer webparts.  If I open another instance of the application on another computer, even though It produces a seperate session ID, the gridview is still displaying in the consumer webpart.  How can I prevent this?