Windows 8 App with Share contract only - windows-8

Is it possible to create an app that "only" shows while using Share charm? I do not want the fullscreen app to be opened via live tile as there is no content to be displayed. I want it to be displayed only through Share charm.

No, it is not possible for an app to be shown only as a Share target. All Windows Store apps have a tile on the Start Screen that can be used to launch the app.

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Why is app icon missing for toast notifications in action center on desktop?

I'm developing an app that uses toast notifications to notify the user. These notifications are raised when the app is running in the background and go to the notification center.
All is well, but on desktop the app icon is missing for the notification group. When testing the app on Windows 10 Mobile the icon is there.
(Note: Shown above is the notification group for an app named "Calendar Activity", not the actual notification.)
Why is the app icon missing in the desktop's action center?
Here are some details about my assets:
I used the UWP Tile Generator to generate every asset you can configure in the app manifests 'Visual Assets' section. The files names look like this:
Toast notifications are generated using the UWP Community Toolkit classes, if that matters. So I'm not constructing the XML myself.
What am I missing? What is different between desktop and mobile regarding the notification group icons? Why is the notification icon missing on desktop?
(Win 10 Anniversary, SDK 10.0.14393.0, latest official update level for desktop and mobile (no Insider))
This is a know issue for desktop:
This is a known bug with the Anniversary Update (Version 1607). It only affects your app when deployed locally from Visual Studio. Your app will work correctly when deployed as a release package (like when installed from the Store). - Source

Give permissions to a Windows 8 app to block another app

I'm trying to make my windows 8 app block another app from being launched or launch another app depending on user settings. For example block a browser from opening and launch a media player.
Is this possible?
No, Windows Store apps are running in sandboxed environment and you definitely cannot block any app from being used from another app.

How to programmatically lock an iPad app into one single application?

we are doing a product display iPad app and don't want customers to be able to quit the app pressing the home button. We're planning to use only UIGesture to let the admin users to quit. How to programmatically lock an iPad app into one single application without install any third party app or profile?
There is a feature for this added in iOS 6 Beta 2 called Guided Access, see http://www.idownloadblog.com/2012/06/26/ios-6-guided-access/
Install the iPhone Configuration Utility: http://support.apple.com/kb/DL1465?viewlocale=en_US&locale=en_US
Make a .mobileconfig with the SBStoreDemoAppLock property set to true
Install the mobile config on the device.
Installation of the mobile config can be done using either the iPCU app or by opening the file with Safari on the device.
Now the device is in kiosk mode and the home button is disabled.
Remove the .mobileconfig file (again using the iPCU app) and reboot the device to re-enable the home button.
I believe that the common solution to this problem is a case that covers the home and power buttons. In practice, you'll want something that is fairly robust to prevent theft of the iPad, and that neatly covers access to the dock connector whilst providing power.
A quick google search of iPad kiosk case turns up plenty of options. Use of iPads as PoS displays in stores and at trade shows is incredibly popular.

Can you build a Windows 8 Live Tile that Launches A Website Instead of a Metro App?

Live Tiles are the "front door" for metro apps on Windows 8. Can you instead launch a website instead of a Metro app?
Could you write an app that just does one thing, and that is to launch the browser with the specified Uri:
Launcher.LaunchUriAsync(new Uri("http://my.website.com"));
That has the advantage that it is represented as a traditional app rather than a pinned site, so you can style the tile as you wish.
The closest thing I could find is pinned sites or site tiles.
It doesn't look like you can customize the look and feel of these site tiles, but you can update them with notification counts.
http://blogs.msdn.com/b/ie/archive/2012/04/03/pinned-sites-in-windows-8.aspx

Questions about Sencha Touch

I have done some project using Sencha Touch -> www.estof.net/sencha (php + sencha). I want to ask you guys some questions:
a) I want to create app using sencha and upload to iPad. My app will work only if i connected to wifi or whatever internet?
b) For example i did some application, draw icon. Can I put it on iPad? Then click on icon and my application will work? (will be nice if app tried even to connect to Internet, but APP ICON will be on iPad)
c) Or sencha using only as a web-site?
Sencha apps can work in offline mode. This is done by using a manifest file to cache the required files. This will explain more about it. This is another tutorial using phone gap.
Yes you can create app icons for your apps. In this link, you can see an attribute named 'icon' which specifies the images to be used as the icon. In safari when you take your site, and press the option button on the bottom, there is an option to 'ADD to Home Screen'. This option will add the icon to the home screen.
If you go to the sencha forums and check their showcase section you can see many apps that are actually sold in the app store.
The upcoming version of Sencha is said to have their own api's to access native feature of a phone os. Its more detailed on their website.