As in the <#23#><#23#>, a semicolon (;) indicates the start of a comment.
In <#24#><#24#>, comments can also be introduced by !. This
extension is particularly useful for building <#25#><#25#> scripts. On most
Unix implementations, if the first line of a script looks like this:
then the script can be started directly as if it were a binary. <#28#><#28#>
is loaded behind the scenes and reads and executes the script as a
Scheme program. Of course this assumes that <#29#><#29#> is located in <#30#> /usr/local/bin<#30#>.