Thanks to all of you who have helped me so much!

As I thought, once the "All Queries" sheet  is hidden, no macro  can
reach it.

So at the beginning of each macro that needed a webquery, I wrote:

Application.ScreenUpdating=False (thanks for this, Pascal)
ThisWorkbook.Sheets("All Queries").Visible = True

and at the end:
ThisWorkbook.Sheets("All Queries").Visible = False
Application.ScreenUpdating=True

It works like magic!
I never have thought I could do that.
The people who will use it will wonder!


For now, since I still need to see that sheet very often, I did not
use Dave's proposal for :
ThisWorkbook.Sheets("Sheet2").Visible = xlSheetVeryHidden
I guess I'll introduce that only later.

The same with Private: Once it is private, you can't go to the sub
from the workbook, so I'll keep that for later too!

The only thing that I have tried (copied from the VB Help from Excel,
that I find so unhelpful), was to hide  the sheet when the book opens,
using:

Private Sub App_WorkbookOpen(ByVal "my bookname.xls" As
Workbook)
Worksheets("All Queries").Visible = False
End Sub

and I got the error message:
Compile Error: Expected identifier


Then I tried simply
Private Sub App_WorkbookOpen()
Worksheets("All Queries").Visible = False
End Sub

I did not get any compile error... but it did not work.

Sure I just have to hide it before I save, and it works perfect.

Still, eventually I'll come back and ask how to use the
App_WorkbookOpen.

Because the more I go the more ideas I have!

OK, but I am not so far yet.