Referencing Named Ranges and Sheet Codenames in Multiple Workbooks

Let's suppose I have WorkbookA, which contains worksheets with codenames FirstASheet and SecondASheet. It also includes a named range MyRangeA (scoped to Workbook), and two ranges named SheetRangeA (scoped to FirstASheet and SecondASheet, respectively).
And let's suppose I also have WorkbookB, which contains worksheets with codenames BeginBSheet and EndBSheet. It also includes a named range MyRangeB (scoped to Workbook), and two ranges named SheetRangeB (scoped to BeginBSheet and EndBSheet, respectively).
Note that the sheet names I'm using are the CODEnames, not the names on the sheet tabs.
Finally, suppose I have a macro in WorkbookA, that opens WorkbookB and manipulates data between the two files.

Can someone please explain to me how to reference the various sheets and named ranges within that macro? I'm used to simply using:

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or

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when working with a single file. But with two files open, it seems like Excel doesn't recognize references to the sheets or ranges in WorkbookA when WorkbookB is activated (and vice versa). Even if the names are unique.
What are the rules as far as which names are recognized for the active workbook and for ThisWorkbook (the file running the macro)? How do I refer to a sheet codename (or named range) in the non-active workbook?

Originally Posted by Merf

... with two files open, it seems like Excel doesn't recognize references to the sheets or ranges in WorkbookA when WorkbookB is activated (and vice versa ...

A little "replacement" for this case - copy to one directory and run macro from "WorkbookA.xlsm"

OK, thanks for the info! I already loop through the all worksheets in WorkbookB (by codename) when the macro opens it (to confirm that the correct file has been opened and contains the required sheets), so I can just assign a worksheet variable to each sheet when I find it, and then use that sheet variable from then on.

So, do codename references to sheets in ThisWorkbook still work OK, even when WorkbookB is the active workbook?
And when does the named range short notation ([MyRangeA], for example) work (or not work)? If specified alone (with no workbook specified) is it presumed to apply to ThisWorkbook, or the active workbook? And can you use:

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and so on, or must you (when specifying the sheet or workbook) use the "long form":

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And will that last one even work (even though MyRangeB has a workbook scope), since Range is a Worksheet property, not a Workbook property?