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Generating key press in browser in C
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <X11/extensions/XTest.h>
#include <unistd.h>

static void SendKey (Display *disp, KeySym keysym)
{
  KeyCode keycode = 0;

  keycode = XKeysymToKeycode (disp, keysym);
  if (keycode == 0) return;

  XTestGrabControl (disp, True);

  XTestFakeKeyEvent (disp, keycode, True, 0);
  XTestFakeKeyEvent (disp, keycode, False, 0);

  XSync (disp, False);
  XTestGrabControl (disp, False);
}

/* Main Function */
int main ()
{
  Display *disp = XOpenDisplay (NULL);

  /* A, B */
  SendKey (disp, XK_A);
  SendKey (disp, XK_B);

  return 0;
}