Shell can only start an application, it cannot tell when that application ends or whether an application is already running or not.
The Process object in my Threading library http://www.b4x.com/forum/additional-libraries/1611-threading-library-optimising-compiler.html can start an application and tell you when it ends but cannot tell whether an application is already running or not. While the Thread object needs an optimised compiled app to work the Process object will work in all applications but needs .NET 2.0.
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