In Old BW there is a global array which is supposed to containg config parameters
The idea was that this global array is loaded initialized by (odl)BW/lib/config.php, and that the variables initialisation (the config.php) can be exported to the database and importated to the database via a adminconfig.php tool (currently not working completely).
The reason was to allow teh BW admin to alter something WITHOUT changing config file. He should have just to use the HMI of adminconfig.php for, for example, reducing the limit of people who can logged on at once, or for closing access to the BW website exept to a list of people for maintenance purpose ...
As a consequence $_SYSHCVOL[xxxx] content are used in various places of old BW code to define some parameter. Probably be some other solution can be proposed, but untill it is done I think it is wise to keep the $_SYSHCVOL working (currently, and I perfectly undersand it was needed to progress) they are all disabled in ROX
