A definition's handle at the launch root: reached from nothing, so it carries no back. It is the handle a launch and a continued process return for that screen (the core's ScreenRootHandle), the one type every root result is written with.
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ScreenRootHandle
A definition's handle at the launch root: reached from nothing, so it carries no
back. It is the handle a launch and a continued process return for that screen (the core'sScreenRootHandle), the one type every root result is written with.