Detect if someone is sitting on an object

Is there a way to detect if someone is sitting on an object? Also is it possible to get the location of the avatar that is sitting on it?

In the object itself, you can call llAvatarOnSitTarget(). It will return the avatar's key if seated, otherwise NULL if not.

Thank you shall try it now!

You will also get a changed event when an AV sits on the prim or stands up

    changed(integer change) 
    { 
        // The object's sit target has been triggered 
        if (change & CHANGED_LINK) // Test for a changed link 
        { 
            key avatar = llAvatarOnSitTarget(); 
            if(avatar != NULL_KEY) // Is that changed link an avatar? 
            { 
            } 
            else // Stood up
            { 
            } 
        } 
    }