Is there any concurrency limit to access reports in a web application deployed on IIS 7.5

I am using VS2010 & Crystal Reports version 13.02 to develop and deploy reports web application.

The application is deployed on windows 2008 r2(64 bit), IIS 7.5.

After going thorugh the below link, i have the doubts.

http://www.sdn.sap.com/irj/boc/go/portal/prtroot/docs/library/uuid/804acc00-8364-2b10-b995-de99ca43c403?QuickLink=index&overridelayout=true&32809255175729

1.  Concurrency Limitation:

a.  Confirm if there is a limit(how many users can access reports deployed on IIS concurrenctly).

b.  If the limit is there - what is the limit?  Can it be configured?  If the limit can be configured, what is the procedure and are our servers configured to use the allowable max limit?

2.  Reporting Application: If the concurrency limit (free or purchased product) is reached, is it possible to display a message to the subsequent users indicating that the concurrency limit is reached and if possible, provide them with list of users.

3.  Product(s) to be procured: If we decide to buy the software, which product(s) and how many licenses need to be procured.  Are there any concurrency limits on the purchased product(s).