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Build lab

Component of Microsoft Windows
Other names	Virtual Build lab (VBL) Feature branch level/Feature build lab (FBL)
Introduced in	Windows XP

All build labs

Whistler, XP and Longhorn pre-reset

• The top-most (aka "trunk"): main, intergrates all changes from all labs

ntvbl was renamed to Lab in the beginning of later XP builds development

• • Lab01: Kernel
  • Lab02: Networking
  • Lab03: Server (still sometimes compiles client builds)
  • Lab04: Terminal Services
  • Lab06 (formerly ntvbl06, the oldest lab ever): User interface
  • Lab07: Internet Information Services/COM+
  • idx (example: idx01): Usually recompiles for OEMs, but may be used for public testing

Longhorn-post reset

• The trunk was renamed to winmain
• Lab05 (will be renamed to vbl_core) was introduced. There is a lot of build labs starting with build, but there are some notable one:
  • vbl_ux_?: UX (user interface)
  • vbl_media_ehome: (only for 5284) Intended for homes, so a quick installer called Media Center Diamond Take Home DVD Launcher will appear instead of winpeshl.exe
  • winmain_beta?