Operating system terms,terminology, keywords, definitions

Below are mentioned some terminology related to operating systems.
You might  have come across, this shortforms but never knew what they meant.

Here's the operating system glossary.

APIApplication Programming Interface
BIOSBasic Input Output System
BPBase Pointer
BPBBIOS Parameter Block
CCPConfiguration Control Register
CHSCylinder Head Sector
DIRDigital Input Register
DMADirect Memory Access
DSODownloadable Sub Oliteration
EOFEnd Of File
EXTextended file system
FATFile Allocation Table
FCBFile Control Block
FDCFloppy Drive Controller
FDDFloppy Disk Drive
FLIHFirst Level Interrupt Handler
FTPFile Transfer Protocol
GDTGlobal Descriptor Table
HALHardware Abstraction Table
HDCHard Disk Controller
HDDHard Disk Drives
HPFShigh performance file system
HTTPHyper Text Transfer Protocol
IDTInterrupt Descriptor Table
IFInterrupt Flag
IPInternet Protocol
IPCInter Process Communication
ISAIndustry Standard Architecture
ISRInternet Service Routine
IVTInterrupt Vector Table
LBALogical Block Addressing
LDTLocal Descriptor Table
LPCLow Pin Count
LUTLook up Table
LVMlogical volume manager
MBRMaster Boot Record
MBRmemory buffer register
MMUMemory Manage Unit
MSRMain Status Register
NTFSNew Table File System
NTFSnew TECHNOLOGY file system
NTLDRnew technology loader
OCWOperation Command WOrd
OTPOne Time Programmable
PAEPhysical Address Expansion
PASPhysical Address Space
PCProgram Counter
PCBProcess Control Block
PCBPrinted Circuit Board
PDBRPage Directory Base Register
PDTPage Directory Table
PICProgrammable Interrupt Controller (IC 8259A)
PITProgrammable Interrupt Timer (IC 8254)
PMMPhysical Memory Manager
POSTpower on self test
PPIProgrammable Peripheral Interface
PSEPage Size Extension
PSFSpolyserve file system
PTEPage Table Entries
SCStack Counter
SDLShielded Data Link
SJFshortest job first
SLIHSecond Level Interrupt Handler
SPStack Pointer
STBRsegment table base register
TCPTransmission control protocol
TDRTape Drive Register
TLBTranslation Lookaside Buffer
TSRTerminate and Stay Resident
UDPUser Datagram Protocol
UFSunix file system
USBUniversal Serial Bus
VASVirtual Address Space
VFSVirtual File System
VMMVirtual Memory Manager