XInput's hidden functions

Inside X_Input, there are a couple of undocumented functions. You can load them not by name, but by ordinal.
I tried to find as much as I can about them:

DWORD __stdcall __ordinal(100) XInputGetStateEx(DWORD dwUserIndex, XINPUT_STATE* pState)
The same as XInputGetState, adding the "Guide" button.
#define XINPUT_GAMEPAD_GUIDE 0x0400

DWORD __stdcall __ordinal(101) XInputWaitForGuideButton(DWORD dwUserIndex, DWORD dwFlags, PVOID pUnKnown)
If dwFlags == 0 - blocking until Guide button is pressed. Otherwise, it is async.
I am not clear on how to get the async option to report.

DWORD __stdcall __ordinal(102) XInputCancelGuideButtonWait(DWORD dwUserIndex)
If XInputWaitForGuideButton was activated in async mode, this will stop it.

DWORD __stdcall __ordinal(103) XInputPowerOffController(DWORD dwUserIndex)
I think that his one is clear.

struct _XINPUT_BASE_BUS_INFORMATION
{
WORD a1;
WORD a2;
DWORD a3;
DWORD Flags; // probably
BYTE a4;
BYTE a5;
BYTE a6;
BYTE reserved;
 }
DWORD __stdcall __ordinal(104) XInputGetBaseBusInformation(DWORD dwUserIndex, XINPUT_BASE_BUS_INFORMATION *pInfo)
Not working on all gamepads. It can refuse and return ERROR_DEVICE_NOT_CONNECTED, even if connected.

struct XINPUT_CAPABILITIES_EX
{
XINPUT_CAPABILITIES Capabilities;
WORD a1;
WORD a2;
WORD a3;
DWORD a4;
};
DWORD __stdcall __ordinal(108) XInputGetCapabilitiesEx(DWORD a1, DWORD dwUserIndex, DWORD dwFlags, XINPUT_CAPABILITIES_EX *pCapabilities)
a1 should probably be 1.