Boot.ini is a hidden and read-only text file on the root of the system partition of that is used to create the boot loader menu.
Boot Files are files needed to boot an operating system on a computer.
Backup Site Controller is a Microsoft Message Queue Server (MSMQ) that contains a read-only copy of the primary site controller (PSC) or primary enterprise controller (PEC) database.
Backup Catalog is a representation of the results of performing a backup of servers on a network.
A Backup Domain Controller is a Microsoft Windows NT domain controller containing a read-only copy of the master domain directory database located on the primary domain controller (PDC).
BGP (Border Gateway Protocol) is a standard TCP/IP protocol based on the distance-vector routing algorithm that enables groups of routers to share their routing information in an efficient manner.