LaTeX 2.09 documents

LaTeX2e<#522#><#522#> can process (almost) any LaTeX~2.09 document, by entering <#523#>LaTeX~2.09 compatibility mode<#523#>. Nothing has changed, you run LaTeX<#524#><#524#> in the same way you always did, and you will get much the same results. The reason for the `almost' is that some LaTeX~2.09 packages made use of low-level unsupported features of LaTeX. If you discover such a package, you should find out if it has been updated to work with LaTeX2e. Most packages will still work with LaTeX2e---the easiest way to find out whether a package still works is to try it! LaTeX~2.09 compatibility mode is a comprehensive emulation of LaTeX~2.09, but at the cost of time. Documents can run up to 50 slower in compatibility mode than they did under LaTeX~2.09. In addition, many of the new features of LaTeX2e<#525#><#525#> are not available in LaTeX~2.09 compatibility mode.