ECN: Explicit Congestion Notification
EFS: Encrypting File System
EHS: Exchange Hosted Services
EMF: Enhanced Metafile
ENU: English US
EPG: Electronic Programming Guide
ER: Error Reporting
ERD: Emergency Repair Disk
ERU: Emergency Recovery Utility
ESE: Extensible Storage Engine
ETW: event tracing for Windows
FAT: File Allocation Table
FDDI: Fiber Distributed Data Interface
FR: Folder Redirection
FRS: File Replication Service
FUS: Fast User Switching
FVE: Full Volume Encryption
FVEK: Full Volume Encryption Key
GAL: Global Address List
GC: Global Catalog
GCWN: GIAC Certified WiNdows security administrator
GDR: General Distribution Release
GPMC: Group Policy Management Console
GPO: Group Policy Object
GSI: Genuine Software Initiative
GTA: Grand Theft Auto
GW-Basic: Graphics and Windows Beginner's All-purpose Symbolic Instruction Code
GWBASIC: Graphics and Windows Beginner's All-purpose Symbolic Instruction Code
HAL: Hardware Abstraction Layer
HCL: Hardware Compatibility Lists
HCT: Hardware Compatibility Test
HKCC: HKEY_CURRENT_CONFIG
HKCR: HKEY_CLASSES_ROOT
HKCU: HKEY_CURRENT_USER
HKLM: HKEY_LOCAL_MACHINE
IAS: Internet Authentication Server
ICA: Independent Computing Architecture
ICCC: InterClient Communication Convention
ICCCM: InterClient Communication Convention Manual
ICF: Internet Connection Firewall