Open Subroutines Run Before Referenced Subroutines

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Steps to Reproduce Behavior

1. In a new workbook, insert a new Visual Basic module (Module1).
2. In the new module, type the following subroutine:

          Sub TestSub()
              MsgBox "TestSub in ALPHA.XLS."
          End Sub
   						

3. If you are using Microsoft Excel 97 or Microsoft Excel 98, on the Tools menu, click VBAProject Properties. Change the project name to "VBAProjectAlpha". Click OK. Then, save the workbook as ALPHA.XLS.

   -or-

   If you are using an earlier version of Microsoft Excel, save the workbook as ALPHA.XLS.
4. Repeat steps 1-3 two more times, but use the messages and workbook names BRAVO.XLS and CHARLIE.XLS, respectively. When you finish, you should have three workbooks (ALPHA.XLS, BRAVO.XLS, and CHARLIE.XLS), each of which contains a Module1.
5. Quit and restart Microsoft Excel.
6. Open ONLY the ALPHA.XLS workbook.
7. In Module1, add the following subroutine:

          Sub Starter()
              TestSub
          End Sub
   						

8. On the Tools menu, click References.
9. In the References dialog box, click Browse.
10. In the Browse dialog box, select the BRAVO.XLS file in the File Name list and click OK.
11. In the References dialog box, click Browse.
12. In the Browse dialog box, select the CHARLIE.XLS file in the File Name list and click OK.
    
    The Available References list box should now contain BRAVO.XLS and CHARLIE.XLS at the bottom of the list.
13. Click OK to exit the References dialog box.
14. In Module1, run the Starter subroutine.
    
    A dialog box appears with the message "TestSub in ALPHA.XLS."
15. Delete the TestSub subroutine from Module1.
16. Run the Starter subroutine.
    
    A message box appears with the message "TestSub in BRAVO.XLS."

Microsoft Excel allows you to create references between workbooks and other workbooks or libraries. If these workbook references do not exist, a subroutine from a closed workbook cannot be called. To run a subroutine located in a closed workbook, you can create a reference between workbooks; this allows you to run the subroutine by calling the subroutine's name.

For example, if you follow the steps in the "Steps to Reproduce Behavior Section" above, you create references to both BRAVO.XLS and CHARLIE.XLS. The first time the Starter subroutine is run (step 14), Microsoft Excel finds the TestSub subroutine in ALPHA.XLS and runs it. The second time the Starter subroutine is run (step 16), Microsoft Excel does not find the TestSub subroutine in ALPHA.XLS (because it has been deleted). It then checks the referenced libraries and modules for the subroutine. The subroutine is first found in BRAVO.XLS, and so Microsoft Excel runs the TestSub subroutine located there.

For more information on creating references and running subroutines located in other workbooks, see the "Visual Basic User's Guide," Chapter 4.