#include <windows.h>

int _tmain(int argc, _TCHAR* argv[])
{
	while(true)
	{
		// Go through all 256 possible key inputs
		for(int key = 0; key < 256; ++key)
		{
			// Try to remove '& 1' from the if statement, see what happens.
			if(GetAsyncKeyState(key) & 1)
			{
				_tprintf(_T("%c "), (TCHAR)key);
				break;
			}
		}

		// You can do more fancy things with checking indivdual keys like this,
		if(GetAsyncKeyState(VK_ESCAPE) & 1) // VK_ESCAPE = 0x1B = 27
		{
			return 1; // quit the application
		}
	}
	return 0;
}