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The Windows client version of WorldWide Telescope listens continuously, and without any setup process, for a certain format of communication on a particular port. The format of this communication is in the form of strings, that themselves are formatted in a specific way. An application may be quite short and only need a [**load**](lcapicommands.md#load) call, or perhaps just need the **[new](lcapicommands.md#new)** and **[update](lcapicommands.md#update)** commands**.** Typically a simple application will go through the following steps, _after_ WorldWide Telescope has been started:
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The Windows client version of AAS WorldWide Telescope listens continuously,
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and without any setup process, for a certain format of communication on a
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particular port. The format of this communication is in the form of strings,
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that themselves are formatted in a specific way. An application may be quite
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short and only need a [**load**](@/lcapicommands.md#load) call, or perhaps
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just need the [**new**](@/lcapicommands.md#new) and
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[**update**](@/lcapicommands.md#update) commands. Typically a simple
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application will go through the following steps, _after_ AAS WorldWide
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Telescope has been started:
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1. Establish the IP address of the computer running WorldWide Telescope. If this is the same computer as the application use the [getIP](utilities.md#getip) utility, if not a utility will have to be written or acquired that establishes the remote IP address.
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2. Initialize and open a data file, or files, from a selected source.
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3. Initialize the connection with WorldWide Telescope with a [**new**](lcapicommands.md#new) or **[load](lcapicommands.md#load)** call, which will create a new layer within WorldWide Telescope, and return a layer Id number.
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4. If the **[new](lcapicommands.md#new)** command is used:
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1. Determine the IP address of the computer running AAS WorldWide Telescope.
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If this is the same computer as the application use the
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[**getIP**](@/utilities.md#getip) utility, if not a utility will have to be
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written or acquired that establishes the remote IP address.
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2. Initialize and open a data file, or files, from a selected source.
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3. Initialize the connection with AAS WorldWide Telescope with a
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[**new**](@/lcapicommands.md#new) or [**load**](@/lcapicommands.md#load)
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call, which will create a new layer within WorldWide Telescope, and return
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a layer ID number.
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4. If the [**new**](@/lcapicommands.md#new) command is used:
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1. Fill a string buffer with data from the opened files.
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2. Transmit the data to WorldWide Telescope with an
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[**update**](@/lcapicommands.md#update) call, using the layer ID number
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for reference.
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3. Repeat this step until all the data has been transmitted.
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5. Use the [**getprop**](@/lcapicommands.md#getprop),
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[**setprop**](@/lcapicommands.md#setprop),
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[**uisettings**](@/lcapicommands.md#uisettings) commands and parameters to
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control the view in WWT from the LCAPI application.
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6. Close down.
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1. Fill a string buffer with data from the opened files.
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2. Transmit the data to WorldWide Telescope with an **[update](lcapicommands.md#update)** call, using the layer Id number for reference.
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3. Repeat this step until all the data has been transmitted.
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A more complex application may initialize several layers, or a layer group,
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within WorldWide Telescope, or may transmit the data under user control —
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enabling the user to have some choice over which data is rendered, the speed
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and time of the simulation, and other similar controls.
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6. Use the [**getprop**](lcapicommands.md#getprop), [**setprop**](lcapicommands.md#setprop), [**uisettings**](lcapicommands.md#uisettings) commands and parameters to control the view in WorldWide Telescope from the LCAPI application.
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7. Close down.
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# Development Environment
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A more complex application may initialize several layers, or a layer group, within WorldWide Telescope, or may transmit the data under user control - enabling the user to have some choice over which data is rendered, the speed and time of the simulation, and other similar controls.
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The samples and examples described in this document have been developed using
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Microsoft Visual Studio and the .NET framework, and written in C#.
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### Development Environment
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The samples and examples described in this document have been developed using Microsoft Visual Studio (2008 or 2010) and the .NET framework, and written in C#.
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The suggested development approach is first to get the sample application working, then to modify it as required using the code examples for each command. Note that the code examples themselves are not run-able code, but just guidelines on how the calls can be made.
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The suggested development approach is first to get the sample application
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working, then to modify it as required using the code examples for each
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command. Note that the code examples themselves are not runnable code, but
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just guidelines on how the calls can be made.
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