$C.                      Ctrl-C/Ctrl-S Enable                    Default: $C+

 {$C.}

    Enables/disables control character checking during console I/O. If
    enabled, Ctrl-C will terminate program execution during a Read or
    Readln statement, while Ctrl-S will toggle screen output off and on.
    The enabled (active) state will slow output down.

             $C+    ^C interrupts program, ^S toggles screen output off
                    and on.

             $C-    All control characters are treated as regular input.

          Range:    Entire program.