HSX and some modules put some flags in the database:

http-port: this key contains the port number HTTPD plugin must use.
           It's default value is 8080. This key is only read by the plugin
           during its init stage.

http.disable: if key value is TRUE, HTTPD plugin leaves without doing anything
           during its init stage.
           This key is only read by the plugin during its init stage.

verify.xxx: where xxx is a file extension.
            This key is used by the verify plugin. When a file having xxx as
            file extension should be tested, the plugin uses its key value
            as a shell command line. Filename is append to this command line
            and the verification is performed.
            Ex:  verify.gz key has "gzip -t" as key value

download_queue_size: number of simultaneous downloads allowed on the server.
            If this key doesn't exist when the server starts, it creates one
            with 10 as value. Negative value can be put to disable downloads
            but it is a very very bad idea. If this value is set to 0, when
            the server starts, it resets it to the default value. You'd better
            only use positive value here. Modifying this value when some 
            downloads are queued may create forever hanging downloads.

xfer.speed_limit_type: it is now possible to limit the speed of transfers (ul
            and dl) in several ways. If this key doesn't exist, the server
            assumes its value is 0. The possible values are:
               0: no speed limit, xfer goes as fast as possible
               1: speed is limited for each connection (see xfer.speed_limit
                  key)
               2: speed is limited for each account (all xfers made from the
                  same account have to share a given bandwidth). This type of
                  xfer works only with new style account. (Not yet supported).
               3: speed is limited for the site (see xfer.speed_limit key). All
                  xfers share the same bandwidth.
            Modification of this key doesn't affect running xfers, only new ones
            will be affected.

xfer.speed_limit: According to the previous key, this key contains either the
            speed limit of a single xfer or the speed limit of the whole site.
            The speed is given in KB (1024 bytes) per second. If this key is not
            set, its default value is 10.

cnx.ip: If this key exists and is not empty, it should contains the list of IPs
        which can be used to connect to the server. This function is only useful
        if you have more than one IP on your computer and don't want to allow
        access on all of them. If more than 1 IP is given, they are separated by
        a comma.

banner.type: Type of the banner to display. The possible values are:
               0: no banner to display
               1: banner is local
               2: banner is remote (not yet supported)

banner.file: If banner is local, this key contains the path to banner file,
             either an absolute path or a relative to HSX root path.
             If banner is not local, this key is not taken into account

banner.url: If banner is local, this key contains the URL of the page where a
            user goes if he clicks on the banner.
            If banner is not local, this key is the URL of the banner itself.

file.preview: If this key is set to TRUE, HSX creates file preview when a
            client wants one. If this key not exists or set to FALSE, HSX never
            creates them.

dufs.disable: If set, disable Dynamic User File Sharing.

dufs.root: This variable is the relative path to DUFS root. If not defined,
           the value "dufs" is used.


