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Merge pull request #275 from microsoft/pete-dev
Loopbacks and scheduled messaging
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‎build/staging/version/BundleInfo.wxi

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<Include>
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<?define SetupVersionName="Developer Preview 5" ?>
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</Include>

‎docs/endpoints/virtual-device-app.md

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## Overview
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One way to have app-to-app MIDI on Windows is to use a simple loopback. That is typically created ahead of time, and is available for any applications to use to communicate with each other. The lifetime of these loopback endpoints are not tied to any one application.
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One way to have app-to-app MIDI on Windows is to use a simple loopback. That is typically created ahead of time, and is available for any applications to use to communicate with each other. The lifetime of these loopback endpoints are not tied to any one application. They are simply a pipe between applications.
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Another approach is to allow applications to create and publish an endpoint which is declared through settings inside the application itself. When the application closes, the endpoint closes. That is the model the Virtual Device App feature implements. (If you want the simple pre-created loopback, see the Virtual Loopback transport)
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‎docs/endpoints/virtual-loopback.md

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| (endpoint) description | Optional. This becomes the transport-supplied description for the loopback endpoint. |
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| (endpoint) uniqueId | Required. This is a short (32 characters or fewer) case-insensitive unique Id for the endpoint. When combined with the loopback A/B prefixes in the service, it must be unique across all loopback endpoints in Windows. You can use the same unique id for each endpoint in the same pair, but not the same as other pairs. |
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> Note: Loopback endpoints created in the configuration file cannot be removed by the API. Only loopback endpoints created via the API can be removed via the API. This is by design to help avoid applications changing user configuration.
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# Implementation
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Internally, the Virtual Loopback is implemented as two endpoints which are cross-wired, so anything sent to Loopback A arrives on the input of Loopback B, and vice versa. Each declared pair has an exclusive relationship, and there's no practical limit to the number of loopback pairs you can define.
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Internally, the Virtual Loopback is implemented as two endpoints which are cross-wired, so anything sent out to Loopback A arrives on the input of Loopback B, and vice versa. Each declared pair has an exclusive relationship, and there's no practical limit to the number of loopback pairs you can define.
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‎samples/cpp-winrt/api-loopback-endpoints/PropertySheet.props

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* right-click the project node
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For more advanced scenarios, and complete documentation, please see:
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https://github.com/Microsoft/cppwinrt/tree/master/nuget
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‎samples/cpp-winrt/api-loopback-endpoints/api-loopback-endpoints.sln

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‎samples/cpp-winrt/api-loopback-endpoints/api-loopback-endpoints.vcxproj

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