Quoting strings in the qbwrk.conf must be done with double-quotes. The use of single-quotes may result in unexpected behavior, or values to be ignored altogether.
The qbwrk.conf file format is very similar to the qb.conf format, with just the inclusion of a macro and template inheritance system.
The following parameters are only settable locally on the Worker as they determine where the Qube installation is located, the hostname of the Supervisor, and the filtering field for network communication. They will not have any effect when used in the qbwrk.conf file.