Bf Em
 font
Ef 
    A bitmapped font identifier.
Bf Em
 string
Ef 
  A NUL-terminated ASCII string.
 
The starting raster position is used as the left margin for multi-line strings. Each newline character repositions the raster position at the beginning of the next line.
Nothing is drawn, and the raster position is unaffected when
either:
 - 
Bf Sy
 font
Ef 
 is not a valid OpenGLUT bitmap font
 - 
Bf Sy
 string
Ef 
 is an empty string or NULL pointer
 - The current OpenGL raster position is invalid