1. Why do we use App Engine Launcher instead just using Eclipse for everything related to our project?
GAE Launcher has a better IDE
GAE Launcher creates better code from scratch
Only GAE Launcher can run a web app
Only GAE Launcher can deploy a web app

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2. How do you check whether the web app starting code is running successfully?
You can't check until you deploy it
Just run it and point your browser to localhost

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