Start WCF service host when debugging another project in the same solution

I have got this check box when
I right click on the WCF service project -- click on properties --  Click on WCF Options

My query is
What is the purpose of this check box
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kaufmed 👽Commented:
In Visual Studio, you can only *actively* debug one application per VS instance. If you have an application which relies on the WCF service, and you are wanting to debug the application, you wouldn't be able to say F5 WCF service and F5 application in the same session. This option allows you to start the WCF service and still run your application for debugging.

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you can leave the wcf service running in background and then run your application and if you want to debbug the wcf service go with F11 when the methods of the service are called and you now can debbug the wcf methods
KaranGuptaAuthor Commented:

Even when I uncheck the checkbox I can debug the wcf application from the client's application
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