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-
-Let's create an app that can actually handle input from user.
-
-To do this we will need `ReadKeyStroke` function:
-```
-EFI_SIMPLE_TEXT_INPUT_PROTOCOL.ReadKeyStroke()
-
-Summary:
-Reads the next keystroke from the input device.
-
-Prototype:
-typedef
-EFI_STATUS
-(EFIAPI *EFI_INPUT_READ_KEY) (
- IN EFI_SIMPLE_TEXT_INPUT_PROTOCOL *This,
- OUT EFI_INPUT_KEY *Key
- );
-
-Parameters:
-This 		A pointer to the EFI_SIMPLE_TEXT_INPUT_PROTOCOL instance.
-Key 		A pointer to a buffer that is filled in with the keystroke information
-		for the key that was pressed.
-
-Description:
-The ReadKeyStroke() function reads the next keystroke from the input device.
-
-Status Codes Returned:
-EFI_SUCCESS 		The keystroke information was returned.
-EFI_NOT_READY 		There was no keystroke data available.
-EFI_DEVICE_ERROR 	The keystroke information was not returned due to hardware errors.
-```
-
-The `EFI_INPUT_KEY` function is defined like this:
-```
-typedef struct {
- UINT16 ScanCode;
- CHAR16 UnicodeChar;
-} EFI_INPUT_KEY;
-```
-
-
-Create `InteractiveApp` with the following code:
-```
-#include <Library/UefiBootServicesTableLib.h>
-#include <Library/UefiLib.h>
-
-EFI_STATUS
-EFIAPI
-UefiMain (
-  IN EFI_HANDLE        ImageHandle,
-  IN EFI_SYSTEM_TABLE  *SystemTable
-  )
-{
-  UINTN Index;
-  EFI_INPUT_KEY Key;
-
-  Print(L"Try to guess the secret symbol!\n");
-  Print(L"To quit press 'q'\n");
-
-  while(TRUE) {
-    gBS->WaitForEvent(1, &(gST->ConIn->WaitForKey), &Index);
-    gST->ConIn->ReadKeyStroke(gST->ConIn, &Key);
-    Print(L"ScanCode = %04x, UnicodeChar = %04x (%c)\n", Key.ScanCode, Key.UnicodeChar, Key.UnicodeChar);
-
-    if (Key.UnicodeChar == 'k') {
-      Print(L"Correct!\n");
-      break;
-    } else if (Key.UnicodeChar == 'q') {
-      Print(L"Bye!\n");
-      break;
-    } else {
-      Print(L"Wrong!\n");
-    }
-  }
-  gST->ConIn->Reset(gST->ConIn, FALSE);
-  return EFI_SUCCESS;
-}
-```
-
-The code is pretty simple, so I hope no detailed explanation is needed.
-App asks for the secret symbol and loops until user presses the correct one ('k'), or presses 'q'.
-
-```
-FS0:\> InteractiveApp.efi
-Try to guess the secret symbol!
-To quit press 'q'
-ScanCode = 0000, UnicodeChar = 0066 (f)
-Wrong!
-ScanCode = 0000, UnicodeChar = 0074 (t)
-Wrong!
-ScanCode = 0000, UnicodeChar = 0073 (s)
-Wrong!
-ScanCode = 0000, UnicodeChar = 0069 (i)
-Wrong!
-ScanCode = 0000, UnicodeChar = 0061 (a)
-Wrong!
-ScanCode = 0000, UnicodeChar = 006E (n)
-Wrong!
-ScanCode = 0000, UnicodeChar = 006B (k)
-Correct!
-FS0:\>
-```
-
-With this app you can also look at how special keys are handled.
-This is the output from "PageUp" key:
-```
-ScanCode = 0017, UnicodeChar = 0000 ( )
-Wrong!
-ScanCode = 0000, UnicodeChar = 005B ([)
-Wrong!
-ScanCode = 0000, UnicodeChar = 0035 (5)
-Wrong!
-ScanCode = 0000, UnicodeChar = 007E (~)
-Wrong!
-```
-