[win32] - how use the zorder and tab index?

i understand how can i create windows controls. but i don't understand how works the zorder and tab index... can anyone explain to me?
what i know is just:
zorder: the control is showed on front or back to other control;
tab index: is the tab order(when we press the tab key for move the focus to another control).

but how i can do these order using WIN32?
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