How to get a console during hp-ux startup

Sometimes a problem appears during the startup of hp-ux (eg network problems) and the startup process hangs (eg when trying to connect to NIS server or something else). A fix like temporary deactivation of NIS could be done easily - but how to get a login to do this?

Just press Crtl-Shift-\ (on US-keyboard, so this is: Crtl-|) and a login prompt will appear!