You can provide your own definition of many TeX and LaTeX commands by including a definitions file. This file contains entries of the form
operation name optional-stringLines may be commented out by starting them with the character #.
dimen topsep asis underline 1 nop thispagestyle 1 name mu 0 u raw seprule 0 <HR>The first line states that \topsep is a dimension; tohtml will understand what to do when it sees this name. The second line says that \underline is a command with a single argument and that the appropriate HTML for this is to use the argument (thus, \underline{abc} will become abc in the HTML document). The third line says that \thispagestyle is a command with a single argument and can be ignored (performs no operation, or `no-op'). The fourth line tells tohtml to replace \mu with u. The last line tells tohtml to replace \seprule with the HTML command <HR>. Any number of -basedef files may be specified; they are processed in order starting from the left. The default basedef file is always read first.