Listing all instances of excel

cytop has some excellent code here: List all open workbooks in all instances of Excel.

However there is one snag

The piece of code:

Public Enum ExternalRef
Worksheet
Workbook
Application
End Enum

interferes wit any Application function, such as Application.ScreenUpdating = False. I get an error, invalid qualifier, which of course it is. Any suggestions on how to get around this.

I don't know if this fixes the problem or not. I am not familiar with Enum and what it does.

Online 38, change Application to ApplicInstance

Then on line 78 change ExternalRef.Application to ExternalRef.ApplicInstance

Then online 122 change oWhich = Application to oWhich = ApplicInstance

Could somebody confirm if this is correct. Does the Enum statement beginning online 35 have to contain objects

Public Enum ExternalRef
Worksheet
Workbook
Application  <== This guy right here, Does this have to be an object for the program to fulfill its intended purpose?
End Enum

If someone could elaborate on this it would be appreciated.

Thanks