  Crt Unit Procedures and Functions
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  AssignCrt        Proc   Associates a text file with the CRT window.
  ClrEol           Proc   Clears all the characters from the cursor
                          position to the end of the line.
  ClrScr           Proc   Clears the screen and returns the cursor to the
                          upper left corner.
  Delay            Proc   Delays a specifed number of milliseconds.
  DelLine          Proc   Deletes the line containing the cursor.
  GotoXY           Proc   Moves the cursor to the given coordinates within
                          the virtual screen.
  HighVideo        Proc   Selects high-intensity characters.
  InsLine          Proc   Inserts an empty line at the cursor position.
  KeyPressed       Func   Determines if a key has been pressed on the
                          keyboard.
  LowVideo         Proc   Selects low-intensity characters.
  NormVideo        Proc   Selects the original text attribute read from
                          the cursor location at startup.
  NoSound          Proc   Turns off the computer's internal speaker.
  ReadKey          Func   Reads a character from the keyboard.
  Sound            Proc   Starts the internal speaker.
  TextBackground   Proc   Selects the background color.
  TextColor        Proc   Selects the foreground character color.
  TextMode         Proc   Selects a specific text mode.
  WhereX           Func   Returns the X coordinate of the current cursor
                          location.
  WhereY           Func   Returns the Y coordinate of the current cursor
                          location.
  Window           Proc   Defines a text window on the screen.
