void Spy(TssStruct *tss)
{
  Ltf *swap,*menu=Fs->cur_ltf->menu_ltf;
  BoolU4 old_preempt=Preempt(OFF);
  SysHashTable *old_hash=Fs->hash_table;
  Fs->cur_ltf->menu_ltf=NULL;
  Fs->hash_table=tss->hash_table;
  Fs->double_buf_cur_ltf=LtfNew;
  while (!ScanKey) {
    LtfDel(Fs->cur_ltf);
    Fs->cur_ltf=LtfNew;
    StackRep(tss->rsp);
    swap=Fs->double_buf_cur_ltf;
    Fs->double_buf_cur_ltf=Fs->cur_ltf;
    Fs->cur_ltf=swap;
    WinSync;
  }
  LtfDel(Fs->double_buf_cur_ltf);
  Fs->double_buf_cur_ltf=NULL;
  Fs->hash_table=old_hash;
  Fs->cur_ltf->menu_ltf=menu;
  Preempt(old_preempt);
}