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I'm narrowing it down, hopefully.

Cross-posted to 6 groups.

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stackoverflow.com/questions/50623154/c-sharp-wpf-windows-10-1803-touchkeyboard-unreliable-issue-prism-clickonce
I'm narrowing it down, hopefully.
To toggle the keyboard on and off:

if ( WM == WM_HOTKEY && C == 'K' ) {  //  A mouse button takes me here.
  static double  Mark ;               //  Jeff-Relf.Me/g600.PNG

  //  "TabTIP.EXE" ( Tablet Touch Input Pane ) must be invoked at least once;
  //  it needs to be launched periodically as well, I think, 
  //  but I'm not sure how often; more than once a minute is bad, I think.

  Secs > Mark + 60 ?
    Launch( L"%CommonProgramW6432%/microsoft shared/ink/TabTIP.EXE" ),
    Mark = _Secs : 0;

  static const GUID CLSID_UIHostNoLaunch = { 0x4CE576FA, 0x83DC, 0x4f88,
     0x95, 0x1C, 0x9D, 0x07, 0x82, 0xB4, 0xE3, 0x76 };
  static const GUID IID_ITipInvocation   = { 0x37c994e7, 0x432b, 0x4834,
     0xa2, 0xf7, 0xdc, 0xe1, 0xf1, 0x3b, 0x83, 0x4b };
  struct ITipInvocation : IUnknown {  virtual HRESULT STDMETHODCALLTYPE
     Toggle( HWND wnd ) = 0;  }  * KB = 0 ;
  CoCreateInstance( CLSID_UIHostNoLaunch, 0, CLSCTX_INPROC_HANDLER |
     CLSCTX_LOCAL_SERVER, IID_ITipInvocation, (void**) & KB );
  
  //  Toggle the keyboard ( Firefox and Chrome require this ):
  KB ? KB->Toggle( GetDesktopWindow() ), KB->Release() : 0 ;   }
......
typedef LARGE_INTEGER  DubInt ;  unsigned __int64  u64 ;
u64  _Tics, Hz ;  double _Secs, _Hz ;
#define  Tics ( QueryPerformanceCounter( ( DubInt * ) & _Tics ), _Tics )
#define  Secs ( _Secs = Tics / _Hz )
//  CoInitialize(0), QueryPerformanceFrequency( (DubInt *) &Hz ), _Hz = Hz ;

Launch( wchar  *Cmd ) {  wchar  _Cmd[333];  static PROCESS_INFORMATION Stat ;
  static STARTUPINFO SU = { sizeof SU };
  SetEnvironmentVariable( L"__compat_layer", L"RunAsInvoker" );
  ExpandEnvironmentStrings( Cmd, _Cmd, 333 ), Cmd = _Cmd ;
  if ( CreateProcess( 0, Cmd, 0,0,1,0,0,0, &SU , &Stat ) )
    CloseHandle( Stat.hProcess ), CloseHandle( Stat.hThread );  }

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Toggling "Touch Keyboard" On/Off, Firefox and Chrome. Jeff-Relf.Me  @. - 2018-07-10 13:52 -0700
  Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. % <persent@gmail.com> - 2018-07-10 13:56 -0700
  ReKilling Cortana zombies. Jeff-Relf.Me  @. - 2018-07-13 01:47 -0700
  Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. Storage Unit <storage.unit@mailinator.com> - 2018-07-15 22:01 -0500
    As I get older, I give fewer and fewer fucks. Jeff-Relf.Me  @. - 2018-07-15 22:09 -0700
      If the keyboard doesn't come up right away. Jeff-Relf.Me  @. - 2018-07-16 06:12 -0700
        ITipInvocation.Toggle() fails BIG TIME if it's called more than once a second. Jeff-Relf.Me  @. - 2018-07-23 03:12 -0700
          I'm narrowing it down, hopefully. Jeff-Relf.Me  @. - 2018-07-23 16:34 -0700
            InputApp and TabTIP are _always_ killed. Jeff-Relf.Me  @. - 2018-07-25 05:48 -0700
              Kill&ReStart the "touch keyboard" before bringing it "up" ( on screen ). Jeff-Relf.Me  @. - 2018-07-28 12:31 -0700
                Kill&ReStart the "touch keyboard" before bringing it "up" ( on screen ). Jeff-Relf.Me  @. - 2018-07-30 06:15 -0700
        Re: Another fail, another post... "Colonel Edmund J. Burke" <burkesbabes@bigass-babes.com> - 2018-07-25 07:00 -0700
    Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-07-16 16:05 +0000
      Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. Paavo Helde <myfirstname@osa.pri.ee> - 2018-07-16 19:31 +0300
      Switch SysFolders to Short, Friendly Paths, all under "C:\__" ( Home ). Jeff-Relf.Me  @. - 2018-07-16 10:15 -0700
      Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. Storage Unit <storage.unit@mailinator.com> - 2018-07-17 05:32 -0500
        Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. % <Persent@gmail.com> - 2018-07-18 06:23 -0700
  Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. "reber G=emc^2" <herbertglazier0@gmail.com> - 2018-07-22 10:43 -0700
    Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. "hanson" <hanson@quick.net> - 2018-07-22 11:06 -0700
    You can convert your speech into text, instead of typing. Jeff-Relf.Me  @. - 2018-07-22 11:48 -0700
      Re: You can convert your speech into text, instead of typing. Double-A <double-a3@hush.com> - 2018-07-22 16:22 -0700
  Re: Toggling "Touch Keyboard" On/Off, Firefox and Chrome. "reber G=emc^2" <herbertglazier0@gmail.com> - 2018-07-31 19:46 -0700
    NewsPapers and HandWritten letters are still good; just not as good. Jeff-Relf.Me  @. - 2018-07-31 20:18 -0700

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