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Simple integration from Web to client side application

Last Modified: 2010-04-16
I am trying to do a small integration between my web application and a client side app.  I am not the developer of the client side app but am in contact with its developers.  The functionality I would like is to have a clickable link/button that causes their application to start with my parameter (a phone number). Pretty much the same as how the mailto protocal opens an email client to the specified address.

Neither side is interested in writing a web service to handle this and we are looking for simplier solutions.  Their side has offered to add a option that will monitor a specfic directory for the creation of a text file containing only the phone number and acting on it, but this requires an ActiveX control to access the client file system.  We only have use of filesystem object for this and don't like our users (even though we aren't a public site and have a controlled user base) having to use minimal security with us or the ActiveX allow popup that comes up everytime when we do.

My question is does anyone know of another technique that would do what I want. One other solution I've considered is dynamically creating a text file and having the users browser automatically open it with a executable that either invokes the client app with its contents as a parameter or just copies it to the monitored location. I don't like the dead page that it leads to (making users click back) and that even if the file type is set to open everytime, the save dialog always comes up.  Help refining this would also be acceptable.
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