Two Windows

#include "graphapp.h"

void close_it(window w)
{
  char *filename = NULL;
  int result = askyesnocancel("Save changes?");

  if (result == YES) {
    filename = askfilesave(NULL, gettext(w));
    if (filename == NULL) /* operation cancelled! */
      return;
    /* save the file somehow */
    askok("The file was sucessfully saved.");
  }
  else if (result == CANCEL)
     return;

  hide(w);
}

void main(void)
{
  window w1, w2;

  w1 = newwindow("file1.txt", rect(0,0,300,250), StandardWindow);
  setclose(w1, close_it);
  show(w1);

  w2 = newwindow("file2.txt", rect(20,20,300,250), StandardWindow);
  setclose(w2, close_it);
  show(w2);

  mainloop();
}

• Source code: win2.c