Windows Wildcard Activate

Hi All, I have an issue with the Windows.Activate property.
I have a macro that vertically splits the view into two windows for the user, and the problem is the specific workbook reference in the syntax.
Here is what I have so far:

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The name of this workbook will change and therfore throw up a reference error, so I was wondering if someone could point me in the right direction. I can't quite figure out how to reference wb1 in the Windows.Activate property.

Thanks!

If you open them in a specific order them reference the Index property.

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Thanks pj, thats a good suggestion, but the end user will already have at least one other workbook open before the macro is ran, so the Index number would be variable.

Thanks

Update:
Haven't come across a solution so far, so in the meantime I've added a bit of code to exit the sub if the workbook name is changed:

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Hopefully a solution is possible, but if not, this way there won't be any errors.

Bumping along.

Update: Ended up finding a solution by using the windows index number. This also solves the problem of having multiple workbooks open, as it will exit the sub if that condition exists

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Marking this as solved.
Thanks