I have problems with the mapemode in VC++ GDI

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VC6

C++

SetWindowExtEx () ;
SetViewportExtEx () ;
SetWindowOrgEx () ;
SetViewportOrgEx () ;

1. the y axis of mode MM_TEXT is from top to down,and that of MM_ISOTROPIC is opposite. so i have a question ,the y axis oriention described above is refer to the page space or device or both ?

2.SetWindowExtEx (),SetViewportExtEx (),can not only set extention for both x axis and y axis ,but also set the x and y oriention .how the to page coordinate translation into device coordinate after that ? And how the quadrant mapps ? That really confused me .

Can someone explain it for me ? Or post a picture illustrating the two coordinates relations ?


PS:
my english is poor ,my fault