Would a Word document variable work for you? Document variables require VBA coding ability to discover and read. See more at
http://support.microsoft.com/kb/306281, from which the following example was taken:
Code:
Sub GetSetDocVars()
Dim fName As String
fName = "Jeff Smith"
' Set contents of variable "fName" in a document using a document
' variable called "FullName".
ActiveDocument.Variables.Add Name:="FullName", Value:=fName
' Retrieve the contents of the document variable.
MsgBox ActiveDocument.Variables("FullName").Value
End Sub