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Newbie Q: Display New Screen?

in the "Simple Sign Up" sample app, in RokuBillingTask.brs, there is a function that brings up a new screen:

sub GetPartialUserData()
    port = CreateObject("roMessagePort")
    channelStore = CreateObject("roChannelStore")
    channelStore.SetMessagePort(port) = channelStore.GetPartialUserData("email") '<===BRINGS UP NEW SCREEN
end sub

Stepping through in the debugger, I see the new screen comes up when the following line is executed: = channelStore.GetPartialUserData("email")

I'm reading the docs but I haven't yet found a page that explains this. How does this bring up a new screen? It appears to just assign a value to the variable ``.

Thanks in advance to all for any info and/or links to appropriate pages in the docs.
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Re: Newbie Q: Display New Screen?

From the documentation for GetUserData:

"In order to call this function, the roChannelStore object needs to have a valid roMessagePort assigned to it by calling the ifChannelStore.SetMessagePort function. Also, since this method displays a dialog, the application must display a UI screen or canvas prior to calling the method. Otherwise, the behavior is undefined."

It brings up a dialog to get the user's ok.

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