.Use Right Ctrl key as Enter(execute) key.
#ifdef UNX
    #ifdef LNX
      Change keymap by xmodmap command.
      Create file,for ex,xmodmap.rctl which contains following line.
        keycode 109 = Return
      Enter the command "xmodmap xmodmap.rctl".
      Then XFree86 generate same code as "Enter"(Return) key for R-Ctrl key.
      This status influence all application. Use Left-Ctrl for modifier key such as Ctrl+....
      Confirm 109 as keycode number by "xmodmap -km".
    #endif
#else
      /Yr option on command line (xe /yr),               Chapter-(7)
      or specify R-Ctl_ENTER = 1 on .INI file            Chapter-(6)
#endif