CLS files in latex use (GO)

CLS files are latex2e format files that determine the layout of the Latex source files. The most general CLS file is our usual article.cls, which is expressed in
/documentclass{article}
This sentence inside. If the Publisher provides a CLS file, we can use the following two methods (if the CLS file is named Xxx.cls):
1) CLS files and your own latex files are placed in the same folder, in the source file with
/DOCUMENTCLASS{XXX}
Instead of
/documentclass{article}
2) Place the CLS file in
C:/ctex/localtexmf/tex/latex Next folder (you can build a folder yourself)
Then refresh the database by doing the following:
Start-All Programs--English Tex set-->miktex-->miktex Options--->refresh,
OK, okay.
In the source file, use
/DOCUMENTCLASS{XXX}
Instead of
/documentclass{article}

Transferred from: http://hi.baidu.com/vardesa/blog/item/6b69e2ed09bf204879f05510.html