In InformationSystems BackOffice is used to refer to Hardware or Software systems which run on a dedicated server rather than on an Lusers desktop.
Payroll systems and ECommerce systems and BackOffice systems. Graphical design and MailClients are FrontOffice?.
BackOffice systems tend to be custom-build (or at least customised) systems built used a PostRelationalDataBase, Apache, etc..
One page links to BackOffice:
