Its for a WAP device, a mobile phone, using WML with a PHP backend.

What I want to do is to allow a user to click on a link and have
something sent to them once only. But I need to ensure that it is sent
once only. Its will be a MIDI file.

Is there anyway in programming PHP to send a file and make sure it is
successfully received at the other end?

Thanks
Simon

I saw your message whilst looking for something else.  I am not
familiar with PHP, but have done a similar thing with ASP.  You just
need to make sure you send out the correct content headers, as well as
the file itself.  As far as actual confirmation is concerned, I am
fairly sure that you cannot tell whether the phone has received it
properly.  However, later nokia phones (including the 7210) do support
COD, nokia's content object descriptor format.  This is a text file
that the phone downloads before it makes a request for your midi file.
 The text file contains a line that tells the phone where to make a
request if it has received the file ok.  COD-Install-Notify I think it
is.  For more info, go to nokia.com and look for COD.

Hope this helps.
Shane.