Thank you for this info. It was clever to notice that every community is managed by an identifying tag, so we can reach there from other front-ends using that tag. I also prefer Steempeak and didn't know this workaround.

I suppose this is possible as long as the front-end allows every tag (as Steempeak and Busy). There are some exclusive front-ends which show only posts that have the specific tag of a community. That is, the Tribes.

Now I'm wondering if one could post something in a community just by adding the tag of that community (hive-xxxx), regardless of the used front-end.