Glossary D DHCP Dynamic Host Configuration Protocol. This allows a networking device in a network to acquire its IP address (and other networking details) automatically, in order to avoid having to configure all devices in a network with fixed IP addresses. VirtualBox has a built-in DHCP server that delivers an IP addresses to a virtual machine when networking is configured to NAT see chapter 6, Virtual networking, page 83. DKMS Dynamic Kernel Module Support. A framework that simplifies installing and updating ex- ternal kernel modules on Linux machines see chapter 2.3.2, The VirtualBox kernel module, page 32. E EFI Extensible Firmware Interface, a firmware built into computers which is designed to replace the aging BIOS. Originally designed by Intel, most modern operating systems can now boot on computers which have EFI instead of a BIOS built into them see chapter 3.12, Alternative firmware (EFI), page 51. EHCI Enhanced Host Controller Interface, the interface that implements the USB 2.0 standard. G GUI Graphical User Interface. Commonly used as an antonym to a “command line interface”, in the context of VirtualBox, we sometimes refer to the main graphical VirtualBox program as the “GUI”, to differentiate it from the VBoxManage interface. GUID See UUID. I IDE Integrated Drive Electronics, an industry standard for hard disk interfaces. See chapter 5.1, Hard disk controllers: IDE, SATA (AHCI), SCSI, SAS, page 71. I/O APIC See APIC. iSCSI Internet SCSI see chapter 5.10, iSCSI servers, page 82. M MAC Media Access Control, a part of an Ethernet network card. A MAC address is a 6-byte number which identifies a network card. It is typically written in hexadecimal notation where the bytes are separated by colons, such as 00:17:3A:5E:CB:08. MSI Message Signalled Interrupts, as supported by modern chipsets such as the ICH9 see chap- ter 3.4.1, “Motherboard” tab, page 43. As opposed to traditional pin-based interrupts, with MSI, a small amount of data can accompany the actual interrupt message. This reduces the amount of hardware pins required, allows for more interrupts and better performance. 267