A quick list of all the worksheets in all the open workbooks can be obtained like this.
Sub SheetNames()
Dim wb As Workbook
Dim ws As Worksheet
For Each wb In Application.Workbooks
Debug.Print "-------------"
Debug.Print wb.Name
For Each ws In wb.Worksheets
Debug.Print " ;" & ws.Name
Next
Next
End Sub
The ";" was added for quick text import where the workbook name was not in the same column as the worksheet name.