1.$ SET NOCONTROL=Y

      The SET CONTROL command in this example disables the Ctrl/Y
      function as well as most Ctrl/C functions.

    2.$ SET CONTROL=T

      The SET CONTROL command in this example enables the Ctrl/T
      function.

    3.$ SET NOCONTROL=(T,Y)

      The SET CONTROL command in this example disables both the
      Ctrl/T and Ctrl/Y functions.

    4.$ <Ctrl/T>
      NODE22::SMITH 16:21:04 (DCL) CPU=00:03:29.39 PF=14802 IO=18652 MEM=68
      $ SET NOCONTROL=T
      $ <Ctrl/T>

      As shown in this example, when you press Ctrl/T, the system
      displays the appropriate information. The SET NOCONTROL=T
      command disables the Ctrl/T function. Now when you press
      Ctrl/T, no information is displayed.

    5.$ TYPE CTRLT_LOOP.COM
      $ inner=0
      $ outer=0
      $ loop:
      $ loop1:
      $ if inner .gt.  20000 then goto end_loop1
      $ inner=inner+1
      $ dcl$ctrlt=F$FAO("Inner loop count is !SL O !S !SL
 			Outer loop count is !SL",inner,outer)
      $ goto loop1
      $ end_loop1:
      $ inner=0
      $ outer=outer+1
      $ goto loop
      $ @CTRLT_LOOP

      <<Press Ctrl/T>>
      NODE1::JSMITH 10:46:37 (DCL) CPU=00:03:42.68 PF=13453 IO=6743 MEM=187
      Inner loop count is 12306
      Outer loop count is 0
      NODE1::JSMITH 10:46:43 (DCL) CPU=00:03:49.19 PF=13455 IO=6744 MEM=187
      Inner loop count is 19200
      Outer loop count is 2
      .
      .
      .
      <<Press Ctrl/C>> <<--- To exit the loop.
      $ SET NOCONTROL=T
      $ @CTRLT_LOOP
      <<Press Ctrl/T>>
      <<Nothing is displayed as CTRL/T is disabled.>>
      <<Press Ctrl/C>> <<--- To exit the loop.

      This example demonstrates the use of DCL$CTRLT within a command
      procedure. The command procedure is running in a loop that
      updates the symbol DCL$CTRLT to indicate the number of loop
      iterations executed so far.