DRAWVLINE - Draw a vertical line

 Purpose:    Draw a vertical line on the screen. 
             
 Format:     DRAWVLINE row column len style [BRIght][BLInk] fg ON [BRIght] 
             bg 
             
             row :  Starting row 
             column :  Starting column 
             len :  Length of line 
             style :  Line drawing style: 
                    1     Single line 
                    2     Double line 
             fg :  Foreground character color 
             bg :  Background character color 
 

 See also:  DRAWBOX and DRAWHLINE. 

 Usage 

 DRAWVLINE is useful for creating attractive screen displays in batch 
 files.  It detects other lines and boxes on the display, and creates the 
 appropriate connector characters when possible (not all types of lines 
 can be connected with the available characters). 

 For example, to draw a double width line along the left margin of the 
 display with bright red characters on a black background: 

 
         drawvline 0 0 25 2 bright red on black
 

 The row and column values are zero-based, so on a standard 25 line by 80 
 column display, valid rows are 0 - 24 and valid columns are 0 - 79. 
  DRAWVLINE checks for a valid row and column, and displays a "Usage" 
 error message if either value is out of range. 

 See Colors and Color Names for details about colors and notes on the use 
 of bright background colors. 

 DRAWVLINE uses the standard line and box drawing characters in the U.S. 
 English extended ASCII character set.  If your system is configured for a 
 different country or language, or a font which does not include these 
 characters, the box may not appear on your screen as you expect.