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Raster Position question...

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I am using perspective mode ( gluPerspective(90.0f, (float)width / (float)height, 0.1f, 100.0f); ). So when I want to display a 2D image without using perspective (ie. for menus, score bar, etc) I have to use glRasterPos2f() . However I can''t seem to get an exact screen position. How do I set the raster position to an exact screen coordinate in 2D such as (400, 50) or (0, 0) etc? Thanks.

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The Projection matrix stack can usually support 2 matrices, so you can do

... whatever projection
glMatrixMode( GL_PROJECTION );
glPushMatrix();
glLoadIdentity();
glRasterPos*( whatever );
glPopMatrix();

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