Preventing the same file from being opened more than once

Hi,
 
Is there a way please, to set NEdit up so that if you try to open up the
same file twice the user will receive a warning or it will prevent them
from doing so.
I'm thinking of a scenario where NEdit opens after clicking on a block
in a diagram.  The user may click this block, opening the editor twice
without realising so.  I understand that the second copy is marked as
such, but my users do not feel this goes far enough.
 
Many thanks
 
Peter
 
SELEX Galileo Ltd
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL
A company registered in England & Wales.  Company no. 02426132
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