It is possible to get the MAC address of a PC using a click button? - asp.net-mvc-3

Is there any way to determine the MAC address of a PC? If so, how? The scenario is after the user clicks a certain button, the MAC address will get saved to a SQL Server database or displayed to a label. I'm trying to do this in a project I am working on in ASP.net MVC3. I haven't tried anything yet because I don't know where and how to start.

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Is it possible to detect if user use our PWA from desktop or from mobile?

I'm working on PWA, this is my first try with it. I have done the tutorial https://developers.google.com/web/fundamentals/codelabs/your-first-pwapp/ and few research but I didn't found anything about my problem : I would like to know if the user is using the app from his desktop or from a mobile, and then, if he uses the app from a desktop, change the start url (in order to go to a real website). Do someone have a clue ?

Uwp - Invalid value for registry

I have an uwp app, which is being distributed using SCCM and every time after a new release is distributed, when a user tries to open the app using the protocol (Eg. Appx:\) an error is displayed by Windows saying "Invalid value for registry" . If the user opens the app using the ícon on the startup menu, it opens without problem and after that there is no problem openning the app using the protocol anymore.
Anyone have any idea why? And how to solve it ?
The uwp app is built over windows anniversary update.
Thank you

Can an OS X app interact with the web browser?

I want to make a Mac app that is able to know things about the page the user is currently viewing.
Is this possible? I have 1Password installed, and it seems to be able to fill in forms, so it must be possible. Or am I mistaken in what is happening?
If that is what is happening, how does the Mac app find the current open window, find the forms on that page, and then enter the text into them?
I think 1password has an actual browser plugin, which a user would explicitly give permission to view their visited websites. I would imagine that's how it would be able to prefill forms automatically. If you write a browser plugin, you can do this too, but again by requesting permission from the user first.

Mac - Showing my service in printers list

I created a Mac app/service that will be shown in menu bar (and not in dock) that will take care of printing through my cloud server.
What I'm looking is to show this as part of printer list. For example, when a user wants to print a word doc from MSWord, click on Command+P which shows the printer UI where user can select the printer. Now I want to show my app/service as part of the printers list so that the doc can be printed directly using my cloud server.
Is it possible to do such thing. Or any other ideas will be appreciated.
Thanks in advance.
--satyam.
We have to create a device driver. It cannot be achieved using regular application development in Java or Objective C.

Windows Phone 7 Emulator Not able to connect to Windows Live ID

I'm trying to connect to Windows Live ID using the Live SDK from this site: http://msdn.microsoft.com/en-us/library/live/hh243641.aspx
When I run this code in my emulator, I get the Live SignIn Button. When I click on it, it tries to connect to Windows Live, but always ends up with
"We're unable to complete your request
Windows Live ID is experiencing technical difficulties. Please try again later."
And this happens all the time - does it need some permission or sth like that?
Ok, this happened because I gave a wrong ClientId in the XAML code for the signIn Button.
If you use a Sign In Button, you have to provide the ClientId property along with the ID you got.

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