Retrieving current modelview matrix...

I''ve made a few similar posts here recently, but i think this one still deserves a thread of its own. Under OpenGL, how do I retrive the current Matrices in the stack? I want to simulate the transformations a vertex goes by till it is rasterized... ... I''ve got a well designed Excel page with macros for matrix & vertex math, cause I''m trying not only to understand the graphics pipeline, but to understand some of the math used in shaders, specificly, knowing in which "space" to put a vertex to perform a certain calculation (ex: put the vertex in world-space to do lighting calculation, or x-space to do this/that...) I''m also adding stuff to my engine to be able to visualy see the impact it has when I alter a value in a matrix, etc... Thanks for any inputs on this...

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