Communication between different winform applications using WCF?

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.NET3.5

C#

.NET

WCF

WinForms

C#4.0

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I have different winform applications, App1, app2, app3 and so on. App1 calls the exe of app2 (using DOS command window) and sends a message to start the app2. The app2 starts executing and once it finishes its task it sends back the message to app1 that the execution was successful. Once app1 recieves message from app 2 for the sucessful exectuion then it calls the exe of app3 and sends the message to start and waits untill recieves the confirmation of the sucessfulll execution of app3. and call app4 and so on. All the application are developed in c#.net win forms and are on same system. How can I achieve this functionality using WCF?

Earlier the same code was written in foxpro and this func was achieved using memory management.