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Question about using glOrtho

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If I use:
  glOrtho(0.0f, 1.0f, 1.0f, 0.0f, -1.0f, 1.0f);  
to set the ortho projection and if all of my coordinates for a GUI (2D overlays) are in the range of 0 to 1, and if I have a quad drawn on my (800,600) display at: (.0f0, 0.0f) (0.5f, 0.0f) (0.5f, 0.5f) 0.0f, 0.5f) will that quad be drawn starting at (400,300)? Or does the glOrtho command need the screen width and height? Hopefully this question makes sense! Thanks - the powerhouse in personal commentary

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