Thanks, Debra, with your advice I did the following, which changes the
header or footer on all charts - just what I wanted!

footer:
==========================================
Sub ChartFooters()

Dim ws As Worksheet
Dim chObj As ChartObject
Dim ch As Chart

For Each ws In ActiveWorkbook.Worksheets
For Each chObj In ws.ChartObjects
With chObj.Chart.PageSetup
.LeftFooter = "&8" & "Prepared by yourname yourdate"
.RightFooter = "&8" & "Printed &T on &D"
End With
Next chObj
Next ws

For Each ch In ActiveWorkbook.Charts
With ch.PageSetup
.LeftFooter = "&8" & "Prepared by yourname yourdate"
.RightFooter = "&8" & "Printed &T on &D"
End With
Next ch

End Sub
================================================== =

and for the headers
================================================== =



Sub ChartHeaders()

Dim ws As Worksheet
Dim chObj As ChartObject
Dim ch As Chart

For Each ws In ActiveWorkbook.Worksheets
For Each chObj In ws.ChartObjects
With chObj.Chart.PageSetup
.LeftHeader = "&8 " & Application.ActiveWorkbook.FullName
.RightHeader = "&A"
End With
Next chObj
Next ws

For Each ch In ActiveWorkbook.Charts
With ch.PageSetup
.LeftHeader = "&8 " & Application.ActiveWorkbook.FullName
.RightHeader = "&A"
End With
Next ch

End Sub

================================================== ====


Next question: how can I print date in long form (i.e. dddd, mmm dd, yyyy)
in place of &D which returns 04/07/2005?