Font selection problems

When using compatibility mode, it is possible that you will find problems with font-changing commands in some old documents. These problems are of two types:

producing error messages;
not producing the font changes you expected.

In case of error messages it is possible that the document (or an old style file used therein) contains references to old internal commands which are no longer defined, see Section~#Sec:oldinternals#459> for more information if this is the case. L^ATEX~2.09 allowed sites to customize their L^ATEX<#460#><#460#> installation, which resulted in documents producing different results on different L^ATEX<#461#><#461#> installations. L^ATEX2_e<#462#><#462#> no longer allows so much customization but, for compatibility with old documents, the local configuration file |latex209.cfg| is loaded every time L^ATEX2_e<#463#><#463#> enters L^ATEX~2.09 compatibility mode. For example, if your site was customized to use the New Font Selection Scheme () with the |oldlfont| option, then you can make L^ATEX2_e<#464#><#464#> emulate this by creating a |latex209.cfg| file containing the command |@oldlfont|. Similarly, to emulate <#465#><#465#> with the |newlfont| option, you can create a |latex209.cfg| file containing |@newlfont|.