Potentially Relevant ACPI names:
I still don't quite understand the "Arg" (Arguments) and "Local#" in ACPI code yet, for what it's worth.

If it has an underscore (_) in front of it, check what it is via "acpihelp.exe" (some non-underscored names are fair game, too) or look it up here in the 5.0(a) specification: http://acpi.info/DOWNLOADS/
The 4-character names without underscores are generally Apple things, unless you're looking at the DZ77RE DSDT. Then they're Intel things.

General:
_GPE - General purpose event
_ADR - Address
_PRW - Power Resources for Waking
_OSC - OS Check
_OSI - OS Information/check
_DSM - Device specific configuration
_INI - Initialization information (contains things like OSYS, OSDW, and the OS checks)
_STA - Device status
_RMV - Device removal
_STR - String (device description)
RP0# - PCI Express Root Port #
P0P# - PCI Express Root Port # (likely #1 in Apple's case, but not sure about Intel)

Apple:

DSDT:
_OSC - OS Check (Checks for OS X)
_OSI - OS Information/check  (Checks for OS X)
PINI - ???????
OSYS - Custom name to diifferentiate between OSes
OSDW - When OSYS = 0x2710 ("Darwin"), meaning "OS X = True" -- Great way to check for Apple's disabling thing for Windows users (just search for OSDW, but be careful or else you might hide the battery sensor from Windows by changing the wrong thing! The places that seem to matter most are around DTLK and the OS Checks in the DSDT, while in the SSDT all instances of OSDW under the PEG1 device seem to have some importance.)
NEXP - Native ACPI OS PCI-e Support (seems to always be 0 on the rMBP)
NHPG - Native PCI-e Hotplug
NPME - Native PCI-e power management
LINK(A/B/C/D) - ????? PCI-E links?
LWE(0/1/2/3) - ?????? Don't seem to do anything
PEG1 - The Thunderbolt controller's PCI-e x8 controller port (anything under this device has to do with Thunderbolt in some way)

SSDT:
DTBP - ??????
TBBT - ??????
RMCR - Remove Cactus Ridge (probably); removes/powers down Thunderbolt controller
RMCW - Remove Cactus Ridge on Wake ??? That's what it seems to do
DTLK - Turn off power to the Thunderbolt controller
RMC1 - Same as DTLK
GP23 - GPIO line that provides power or not depnding on if it's set to 1 or 0
GP04 - Possibly a GPIO point that returns 1 when a device is connected while GP23/Thudnerbolt controller is off
GD04 -??????
XRIL - Checks GP04 status (This in combination with TRPE may be able to power up the Thunderbolt controller on device plug-in if coded right. The device may not be configured, but it's a start. See: https://lkml.org/lkml/2013/12/2/369 )
XRIN - OS X thunderbolt power saving ???
XRIO - Store something into GD04 (May be related to older Macs' SXIO method)
XRIP - Store something into GI04
SXFP - ??????
TGPE - ????? Thunderbolt General Purpose Event????
TRPE - Probably something like Thunderbolt Runtime Power Event (was called XRPE on older Macs)
LACR - ???? Some object in high memory??
LACT - ???? same as above
LDIS - ???? same as above
LRTN - ???? same as above
LTRN - ???? same as above
SSPD - ???? same as above
CSPD - ???? same as above
TSPD - ???? same as above
MABT - ?????
PUPD - ?????
PSTA - ???? Power Status ??
P2TR - ????
T2PR - ?????
EJCD - Probably stands for Eject CD, but might be a high memory/UEFI-set method or name that gets set by using "Safely Remove Hardware"
_EJ0 - Method that ejects the Thudnerbolt Controller
UPSB - Thunderbolt PCI-e Upstream port (related to UPS0)
DSB# - Thunderbolt PCI-e Downstream port
AVND - ???? Something that seems important and related to Thunderbolt device presence
NHI0 - Thunderbolt controller
PSSR - ???? Whatever it is it seems like OSes that aren't OS X get values swapped in the buffer (hard to explain; see the DSDT code)
P1SR - Similar to above


Intel:

DSDT:
(Some taken from http://patentimages.storage.googleapis.com/pdfs/US8069228.pdf )
NEXP - Native ACPI OS PCI-e Support (probably)
NHPG - Native PCI-e Hotplug
NPME - Native PCI-e power management
HPEX - Hotplug SCI Enable (what does that mean?)
PMEX - Power Management SCI Enable (what does that mean?)
HPSX - Hotplug SCI Status (what does this mean?)
PMSX - ????? (maybe Power Management SCI Status?)
PXSX - ???? (It seems to be the upstream PCI-e root port on the Thunderbolt controller)


-KNNSpeed
First version 8/2/2014