Remove the printed message from openGL screen

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OpenGL

Hello,

I am making a GUI in visual c++6.0 using openGL.
For printing the characters on the openGL screen, we make use of glprint command.
Is there any command which can clear off what we have printed.
For example, if I give a print command in openGL;

glprint(10,20,"123",0);

Now if I want to remove what I have printed on screen, which command shall I use?

Thanks,

Timkee