Grid Computing

First let us know what is grid. It is nothing but group of computers. It can be for storing the data, execution of apps, or managing events.
Grid computing is nothing but program solutions to run in a grid environment. How difficult they are? So, this grid computing software is designed to solve all the issues of grid computing in a single runtime? Facade patterns are the best examples for decoupling one to other , I mean requester and responder.
so, future is Grid computing as we talk about software as a service.