/* $DOC$
   $NAME$
      ScreenAttr()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      ScreenAttr( [<nRow>], [<nColumn>] ) -> <nAttr>
   $ARGUMENTS$
      <nRow>     Designates the line from which to determine the attribute.
                 The default is the cursor line.

      <nColumn>  Designates the column from which to determine the
                 attribute.  The default is the cursor column.

   $RETURNS$
      ScreenAttr() returns the attribute at the designated position.

   $DESCRIPTION$
      ScreenAttr() returns the current screen attribute at <nRow> and
      <nColumn>.  You can query targeted attributes this way and save them
      to use later, or process them later with InvertAttr().

      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      ScreenMix()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      ScreenMix( <cCharString>, <cAttributeString>, [<nRow>], [<nCol>] ) -> <cEmptyString>
   $ARGUMENTS$

   $RETURNS$

   $DESCRIPTION$
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      SayScreen()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      SayScreen( <cString>, [<nRow>], [<nCol>] ) -> <cEmptyString>
   $ARGUMENTS$
      <cString> - the string to output. Although undocumented, can be NIL.
      <nRow> - row number, defaults to cursor row.
      <nCol> - column number, defaults to cursor column.
   $RETURNS$
      Returns an empty string.
   $DESCRIPTION$
      Outputs a string at specified coordinates without changing character
      attributes.
   $EXAMPLES$

   $STATUS$
      Ready
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$
      ScreenMix()
   $END$
 */

/* $DOC$
   $NAME$
      InvertWin()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$

   $ARGUMENTS$

   $RETURNS$

   $DESCRIPTION$
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$
      InvertWin() is compatible with CT3's InvertWin().
   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      UnTextWin()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      UnTextWin( <nTopLine>, <nLeftColumn>, <nBottomLine>, <nRightColumn>,
                 <cReplacementCharacter|nReplacementCharacter>,
                 [<cInitialCharacter|nInitialCharacter>],
                 [<cEndCharacter|nEndCharacter>] ) --> cNull
   $ARGUMENTS$
      <nTopLine>  Designates the line for the upper-left corner of the
        area.
      <nLeftColumn>  Designates the column for the upper-left corner of
        the area.
      <nBottomLine>  Designates the line for the bottom-right corner of
        the area.
      <nRightColumn>  Designates the line for the bottom-right column of
        the area.
      <cReplacementCharacter|nReplacementCharacter>  Replaces each
        character within the window, with the exception of those within the
        range of <cInitialCharacter|nInitialCharacter> and
      <cEndCharacter|nEndCharacter>.
      <cInitialCharacter|nInitialCharacter>  Designates the beginning of
        the bracketed area.  The character can be number in the range of 0 to
        255, or the character string type.  The default value is 176.
      <cEndCharacter|nEndCharacter>  Designates the end of the bracketed
        area.  The character can be number in the range of 0 to 255 or the
        character string type.  The default value is 223.
   $RETURNS$
      Returns a null string.
   $DESCRIPTION$
      Replaces an area of characters from a region of the screen
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      CharWin()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      CharWin( <nTop>, <nLeft>, <nBottom>, <nRight>, [<cNewChar|nNewChar>],
               [<cOldChar|nOldChar>] ) --> <cEmptyString>
   $ARGUMENTS$
      <nTop> - top row number, default 0
      <nLeft> - left column number, default 0
      <nBottom> - top row number, default MaxRow()
      <nRight> - right column number, default MaxCol()
      <cNewChar|nNewChar> - new character for the screen area,
            as a numeric value in the range of 0 to
            255 or as a character string, default value is the CLEARB.
      <cOldChar|nOldChar> - character to exchange. Specify the parameter
            as a numeric in the range of 0 to 255
            or as a character string.  The default is to exchange all characters.
   $RETURNS$
      Returns an empty string.
   $DESCRIPTION$
      Exchanges particular characters in a screen area.
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      ColorWin()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      ColorWin( [<nTopLine>], [<nLeftCol>], [<nBottomLine>], [<nRightCol>],
                [<cNewAttr|nNewAttr>], [<cOldAttr|nOldAttr>] ) --> cNull
   $ARGUMENTS$
      <nTopLine>  Designates the topmost line to begin processing.  The
        default is the cursor line.
      <nLeftCol>  Designates the leftmost column to begin processing.  The
        default is the cursor column.
      <nBottomLine>  Designates the bottommost line that is processed.
        The default is the last screen line or window line.
      <nRightCol>  Designates the rightmost column to clear.  The default
        is the right screen border or window border.
      <cNewAttr|nNewAttr>  Designates the new attribute to replace the old
        one.  The default is the standard attribute CLEARA.
      <cOldAttr|nOldAttr>  Designates the old character to exchange.  The
        default is "exchange all attributes".
   $RETURNS$
      Returns an empty string.
   $DESCRIPTION$
      Exchanges particular attributes in a screen area
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      ScreenText()
   $CATEGORY$
      CT video functions (Harbour extension)
   $ONELINER$

   $SYNTAX$
      ScreenText( <nTop>, <nLeft>, <nBottom>, <nRight> )
   $ARGUMENTS$
      <nTop> - top row number, default 0
      <nLeft> - left column number, default 0
      <nBottom> - top row number, default MaxRow()
      <nRight> - right column number, default MaxCol()
   $RETURNS$
      Returns string with characters taken from given screen region.
   $DESCRIPTION$
      Returns string with characters taken from given screen region.
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */

/* $DOC$
   $NAME$
      ColorRepl()
   $CATEGORY$
      CT3 video functions
   $ONELINER$

   $SYNTAX$
      ColorRepl( [<cNewAttr|nNewAttr>], [<cOldAttr|nOldAttr>] ) --> cNull
   $ARGUMENTS$
      <cNewAttr|nNewAttr>  Designates the new attribute.  The default is
        CLEARA.
      <cOldAttr|InOldAttr>  Designates the old attribute to exchange.  The
        default is all existing attributes.
   $RETURNS$
      Returns an empty string.
   $DESCRIPTION$
      Exchanges particular screen attributes
      TODO: add documentation
   $EXAMPLES$

   $STATUS$
      Started
   $COMPLIANCE$

   $PLATFORMS$
      All
   $FILES$
      Library is hbct.
   $SEEALSO$

   $END$
 */