Apache Reference Manual (11)

ServerRoot directive
Syntax:serverroot Directory-filename
Default:serverroot/usr/local/apache
Context:server Config
Status:core
The SERVERROOT directive sets the directory in which the server lives. Typically it would contain the subdirectories Conf/and logs/. Relative paths for the other configuration files are taken as relative to this directory.
Also the-d option to httpd.
Also the security tips for information on the "How to" properly set permissions on the ServerRoot.
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serversignature directive
Syntax:serversignature off | On | EMail
Default:serversignature off
Context:server config, virtual host, directory,. htaccess
Status:core
Compatibility:serversignature is only available in Apache 1.3 and later.
The serversignature directive allows the configuration of a trailing footer line under server-generated documents (Error M Essages, mod_proxy FTP directory listings, mod_info output, ...). The reason why you would want to enable such a footer line are that in a chain of proxies, the user often has no possibilit Y to tell which of the chained servers actually produced a returned an error message.
The off setting, which are the default, suppresses the error line (and are therefore compatible with the behavior of apache- 1.2 and below). The on setting simply adds a line with the server version number and ServerName of the serving virtual host, and the EMail Setting additionally creates a "mailto:" reference to the ServerAdmin of the referenced document.
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Servertokens directive
Syntax:servertokens minimal| os| Full
Default:servertokens full
Context:server Config
Status:core
Compatibility:servertokens is only available in Apache 1.3 and later
This directive controls whether Server response Header field which are sent back to clients includes a description of the G Eneric Os-type of the "server as" information about compiled-in modules.