Love the new SPFx capabilities. Just set up my dev environment, started gulp serve, and HelloWorld rendered on the localhost workbench. Made a code change, saved the file, gulp serve re-published the project and pushed the same changes up to my online development site. Re-added the web part and voila, they are the same in both places.
Can anyone explain HOW gulp "knows" which online tenant I'm using for development? I don't think I ever told it. I'm using two different login identities -- one for my domain-based PC and the other in O365.
How is the "link" between my local dev environment and my target tenant established and maintained?