RetVal% = BCX_LINE(hWnd, _
                  StartX%, _
                  StartY%, _
                    EndX%, _
                    EndY%  _
                  [, Pen]  _
              [, DrawHDC])

 Parameters:

• hWnd Identifies the window where drawing takes place.
• StartX X-coordinate start of line.
• StartY Y-coordinate start of line.
• EndX X-coordinate end of line.
• EndY Y-coordinate end of line.
• Pen [OPTIONAL] integer representing the RGB color code. The default is 0 which is a black pen.
• DrawHDC [OPTIONAL] HDC(Handle to Device Context) pointing to an already open HDC. This is useful if a device context is to be written to many times. In this case the programmer is responsible for closing the HDC at the appropriate time.

 Return Value:

• RetVal% is a nonzero integer if the function succeeds, zero if the function fails.