Windows phone developer account works in a single mobile or multi mobiles?
You can have up to three windows phones developer unlocked, per developer (you can relock, and change these even if you no longer have access to the phones, or they are otherwise not working)
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I am looking for some api.
Can I get WiFi HotSpot MAC address on Windows Store APP ?
I know this is not possible in Windows Phone.
No, this is not possible in Windows Store apps either. This is at least partially because it would allow you to find the approximate location of users based on the nearby access points.
Is it possible to use WiFi Direct to connect to another device (Raspberry Pi) without tapping (NFC)?
The app needs to be able to find all WiFi Direct devices (Raspberry Pi's) in its vicinity, and by tapping one a connection is made to send strings.
The app needs to be able to detect new devices, that have never been paired with the phone before.
Windows Phone doesn't support WiFi direct communication from the SDK. Although it is available in Windows 8, its not yet present in phones.
According to Channel 9, MSDN
Windows 8 natively supports Wi-Fi Direct and has integrated the technology into the Windows 8 Play To and proximity sharing experiences.
However this doesn't apply for windows phone.
There are apps on the store which supports it, but I have no idea how to implement that in programming. Take a look at the process of using those apps
http://www.lumiamine.com/2014/07/wifi-direct-on-windows-phone.html
I have a computer with Windows 8 Enterprise (Evaluation) and an Intel Q8300 CPU (which does not support SLAT as far as I know).
I also own a Samsung ATIV S - Windows Phone 8 smartphone.
I would like to develop Windows Phone 8 app(s) but the emulator won't run on my PC. What are my options? Can I plug the phone via the USB cable and debug the app on it? Or this will also require a developer account (which I hear is 100 US dollars per year)?
You have to unlock your phone to debug applications on it, and yes, you need a Windows Phone Developer account to do that. It costs 100$ per year.
MSDN: About deploying and running apps on a Windows Phone device
You have to meet the following prerequisites before you can deploy an
app to a Windows Phone device:
You must be a registered developer. For info about registering as a developer, see Registration info.
The phone must be registered. For more info, see How to register your phone for development.
And about Dev Account cost: Register for a Dev Center account
An annual Dev Center subscription is $99 USD plus any applicable tax.
For that, you’ll get to submit unlimited paid apps to Windows Phone
Store. You can also submit up to 100 free apps.
You do not need to pay for Windows Phone Developer account. All you need is a computer with Zune software running and a USB cable. The rest is mostly automated.
Depending on your app, if you can get 99% working on f.e. android, it might be an option to upload a winphone build to the Windows Phone Store and specify its a beta submission. To do this, yes, you need a developer account. But you dont need to unlock your phone.
Add yourself (and other devs) to the beta tester list and submit the app.
It will be available in ~1 hour, but it doesnt really appear in the store; you need to install it using a link sent to you by mail.
As for debugging, try Weinre.
Looking to migrate my application to Windows 8 as a side-loaded LOB app but I inherently require 2 monitors. One for full-screen 1080p video and one for touch-input. Is this possible? Thank you.
Just to update the answer to this question.
As of Windows 8.1 RTM you can now run metro apps on multiple monitors simultaneously.
Windows Store apps do not support running on more than one monitor, no.
When you launch a Windows Store app, it will appear on whichever monitor shows the Start Screen when the Windows key is pressed. The end user can change this, if desired, using the Win+PgUp or Win+PgDn shortcut keys.
I have searched around a lot but have not found much of anything in regards to local storage for Windows 8, Windows RT, and Windows Phone apps.
I want to display the browser on a page surf and search webpages. When I find the specified webpage, I want to store the url on a local storage of the device.
On another page, I want to display the URLs in a list for fast select and direct surf to the url. I am developing with visual studio 2012 and vb.net.
Local storage options for Windows Store apps is pretty well covered in the dev center topic Accessing app data with the Windows Runtime
In Windows 8 (Windows Store apps), you could use app settings (registry based), local application data (file-based and sandboxed) as well as the roaming versions thereof.
Since you mentioned Windows Phone 8, I'll add that while the same Windows Storage APIs are surfaced for Windows Phone, only local application data will work directly. In Windows Phone 8, local application data is another way of handling isolated storage; however, there is no built-in roaming data option. Additionally, app settings as implemented in Windows 8 is not available in Windows Phone, but you can use isolated storage settings which is semantically equivalent.
I have gone through the web browser terms and conditions, and there it is clearly mentioned that you cannot use the web browser for general browsing, and if you are doing the same, your app would be rejected by the microsoft app store
For reference please go through
http://blogs.msdn.com/b/wsdevsol/archive/2012/10/18/nine-things-you-need-to-know-about-webview.aspx#AN6