.NET: Best practise to debug 2 web service that communicate together?!?

Hi!! I have a proble with debuging me app! my application comunicate with a web service and this web service send a request to another web service... the 1st web service return the data from the second web service to the application. How can I debug the 3 projects (1. windows application / 2 . web service 1 / 3. webservice 2) in 1 solution?!? How to set the refereces in this solution to hit all breakpoints in all of this 3 projects?!?! Please tel me your best practise to debug web services?! regards, gicio