inf文件中，version项中的LayoutFile=Layout.inf, Layout1.inf, Layout2.inf是什么意思？起什么作用？？

inf文件中，version项中的LayoutFile=Layout.inf, Layout1.inf, Layout2.inf是什么意思？起什么作用？？谢谢

Layout.inf
The INF file that contains the SourceDisksFiles and SourceDisksNames sections required for installing the application. This file is usually named LAYOUT.INF. If filename.inf is not specified, the SourceDisksNames and SourceDisksFiles sections must be included in the current INF file.
MSDN，没有也可以的