SMapLS function in kernel32.dll

I found some functions in kernel32.dll eg. SMapLs,FT_Exit,FT_Thunk series. but when I went to look for their reference,I found nothing. Could you tell me what they functions and where to get their details?
yclAsked:
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chensuCommented:
They are undocumented. You should avoid using them because they are subject to change in the future version of Windows.
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yclAuthor Commented:
It seems that these functions is used to map the text on the screen,doesn't it? How to get the map of text currently displayed on the screen?
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chensuCommented:
What do you mean by "the map of text"?
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yclAuthor Commented:
i.e. Where are the chracters of the text displayed on the screen stored? how to get them from my application?
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chensuCommented:
No way. It is up to the applications how to store the text.
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System Programming

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