Public Function EditTable()
Dim dbs As Database
Dim tbl As TableDef
Dim fld As Field
'set a connection to your database - which could be as simple as the
'name of the local db, or you might be using a connection string
Set dbs = DBEngine.OpenDatabase(...connection to your database...)
'open the table called Call
Set tbl = dbs.TableDefs("Call")
'loop through all the fields and append the text Call_
For Each fld In tbl.Fields
fld.Name = "Call_" & fld.Name
Next
End Function