Prompted by this post about accessing a global at its original location after you have changed a mapping, here's a tip about one specific dropdown in Portal that's sometimes useful.
Here's a screenshot of what I get when I go to the System Explorer section of Portal, choose Globals, and look in the ENSDEMO namespace:
Did you notice the dropdown above the one I set to ENSDEMO ?
Here's what happens if I change it from Namespace to its other value, Database:
I've also highlighted how the header bar's Namespace field now reports the implied namespace.
In this way you can use Portal's Namespace/Database dropdown if you need to bypass mappings and go directly to a database to view, export, import, search or delete globals, routines or classes stored in that specific database.