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It makes for the time being

    // sample.c
    #include < KXL.h>

    int main(void)
    {
      Bool flag = False ;

      // Create a window by 100x100.
      // event receives only the bottom of a re-drawing event and key presss.
      // If return key is pushed, it will end.
      KXL_CreateWindow(100, 100, "sample"
                       KXL_EVENT_EXPOSURE_MASK |
                       KXL_EVENT_KEY_PRESS_MASK);

      while(flag != True ){
        // event loop
        while(KXL_CheckEvents()) {
          // which acquires a event
          switch(KXL_GetEvents()) {
          case KXL_EVENT_EXPOSE: // event of re-drawing
            // A frame is cleared
            KXL_ClearFrameImm(0, 0, 100, 100);
            // "sample" is drawn
            KXL_PutText(30, 50, "sample");
            / A frame is made to reflect in a window
            KXL_UpDateImm(0, 0, 100, 100);
            break;
          case KXL_EVENT_KEY_PRESS: // event of key press
            // If a return key was pushed, it will end
            if (KXL_GetKey() == KXL_KEY_Return)
              flag = True;
            break ;
          }
        }
      }
      // A window is closed
      KXL_DeleteWindow();
      return 0;
    }

    gcc sample.c -o sample -L/usr/X11R6/lib -lX11 -lKXL
    ./sample

First of all, a window is created.

      KXL_CreateWindow(100, 100, "sample"
                       KXL_EVENT_EXPOSURE_MASK |
                       KXL_EVENT_KEY_PRESS);

It is a setup that this is window of the size of width 100 and height 100, display it on a title bar as "sample", and it receives re-drawing and key press as an event. At this time, pixmap (referred to as frame below) of the same size is created. Once it does not draw directly to window fundamentally but draws on a frame, a frame is made to reflect in window.
Next, an event is received.

      while(KXL_CheckEvents()){
        switch(KXL_GetEvents()){
        case KXL_EVENT_EXPOSE: // event of re-drawing
              :
        case KXL_EVENT_KEY_PRESS: // event of key press
              :
        }
      }

It is confirmed whether the event occurred in KXL_CheckEvents(). If anything does not have an event, it will escape from while. If an event occurs, it will investigate which event it is by KXL_GetEvents().
Event of Re-drawing(KXL_EVENT_EXPOSE) If it generates, a thing required for a frame will be drawn. The whole frame is cleared first.

      KXL_ClearFrameImm(0, 0, 100, 100);

A frame is cleared here (the left 0, top 0, width 100, height 100).
A character sequence will be drawn if a frame is cleared.

      KXL_PutText(30,50, "sample");

The character which this calls to the left as 30 from the upper left of a frame, and calls "sample" below in the position of 50 is drawn. A default font set "-adobe-courier-bold-r-normal--14-*-*-*-*-*-iso8859-1 " Coming out, the color has become white.
If drawing to a frame finishes, a frame is made to reflect in a window.

      KXL_UpDateImm(0, 0, 100, 100);

A frame (the left 0, top 0, width 100, height 100) is transmitted to a window here.
Event of key press(KXL_EVENT_KEY_PRESS) If it generates, it will judge which key was pushed.

      if (KXL_GetKey() == KXL_KEY_Return)
        flag = True;

KXL_GetKey() The key come out of and pushed is acquired and it is a return key. KXL_KEY_Return True will be set to flag if it becomes. It escapes from a loop now.
Finally a window is closed.

      KXL_DeleteWindow();