In order to control traffic on the POSCON network, a controller must first Sign-In to a Sector + Role combination that they are authorized for. For more information on sector authorizations/approvals, please see the ATC Policies document.
The menu depicted below is invoked by using the SI <KBE> command in the Radar Client command line.
The above menu, and the data that exists within it, constitutes all the available sectors that are able to be opened on POSCON. This data is populated by Facility Data Specialists for whatever FIRs they are responsible for. Controllers are limited by the role permissions granted to them. By default, a controller can sign into any sector using the "Observer" role. More information on roles is outlined in the sub-section below.