make an open workbook an active workbook

can an expert provide me with the vba code to make an open workbook an active workbook.

So, I am in a workbook [lets call it ABC] that has a macro. this workbook needs to refer to another [open] workbook [Lets call that XYZ]

So ABC needs to switch between ABC and XYZ and back from time to time throughout the Macro Process. I thinking that rather than refer to ABC and XYZ I should refer to ThisWorkbook and ????? [XYZ as ??Workbook]

Thanks
JagwarmanAsked:
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nutschConnect With a Mentor Commented:
No need to activate or select your workbooks if you work directly on the object with its parent declared, e.g.

sub someSimpleCode
dim wbk1 as workbook, wbk2 as workbook

set wbk1=thisworkbook
set wbk2=workbooks("otherworkbook.xlsm")

wbk1.sheets("Somesheet").range("A1:B12").copy wbk2.sheets("Other sheet").cells(C5)

'will copy a range from one workbook to another
end sub

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Makes sense?

Thomas
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Ken ButtersCommented:
Question: When you have the two workbooks open... are they running in separate instances of Excel or in the same instance?    

The answer to your question will be quite a bit different if you need to reach across instances of excel.

If the workbooks are in the same instance of excel, then you will only be able to see workbooks one at a time in the same window.

If the workbooks are in different instances of excel, then you can have the both open at the same time in different windows.
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JagwarmanAuthor Commented:
Hi ken.

Always in the same instance

Regards
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Ken ButtersConnect With a Mentor Commented:
There is a collection called workbooks that belongs to each "Application" or Instance of excel.

You can iterate through workbook in that collection, or you can go to a specific workbook if you know the name of the workbook.

In your case, "ABC.xls" and you want to get a reference to "XYZ.xls", you can do so like this:

Sub test1()
    Dim myWorkbook As Workbook
    
    Set myWorkbook = Workbooks("XYZ.xls")
    
End Sub

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If your workbook is in another instance of Excel, then you have to go get that instance of the Excel application first... then you can reference your workbook that way.
Sub test2()
    Dim myWorkbook As Workbook
    
    Dim xlapp As Excel.Application
    
    Set xlapp = GetObject("XYZ.xls").Application
    
    Set myWorkbook = xlapp.Workbooks("XYZ.xls")
    
End Sub

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NOTE:

I would avoid if possible using "Activeworkbook"  The reason for this, is because if you are running the code at the same time that you open up another workbook, the new workbook you are opening becomes the new "Activeworkbook", and it will potentially mess up your macro.

It is a lot safer and cleaner to refer to the workbook you want to act upon by name, rather than by "activeworkbook".
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JagwarmanAuthor Commented:
both excellent thanks
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