Detecting a s/w installed on client machine

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Hello all
I am facing some sort of problem for detecting that a particular web application is installed on client machine or not using Asp.Net/C#.
I have googled about this but the answers were only limited to navigator.appname etc type which does not fit with this.
Exact point is that whenever user opens my website (created in asp.net C#) on his /her browser than the website detects some sort of web application being installed on user machine.
If it is not the website shows an error message or somewhat like this.

Pls help me.

Posted 13-Mar-13 19:34pm

utkarsh3146

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Sergey Alexandrovich Kryukov 14-Mar-13 1:43am

It makes no sense at all. You need to learn just a bit what Web applications generally do.
I'm sorry to say that right now you have no clue. Just read about it; it's not hard to learn.
—SA

Richard MacCutchan 14-Mar-13 5:27am

Web browsers are not allowed access to this sort of information on client systems.

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