Knowing the application name, keyname and window handle, the following sample code fragment shows how to save the current size and position of the given window:

#define INCL_WINWORKPLACE
#include "os2.h"

{
  BOOL rc;

  rc = WinStoreWindowPos(vszAppName,szKey,hwnd);
  if (rc)
    /* Window size and position saved */
  else
    /* ERROR occurred */

/* Later you would use WinRestoreWindowPos to restore the window */
/* to it's previously saved size and position                    */

  .
  .
  .

rc = WinRestoreWindowPos(vszAppName,szKey,hwnd);
if (rc)
  /* Window size and position restored */
else
  /* ERROR occurred */
}