The full list of ERDAS license feature codes is located in C:\Program Files\ERDAS\Shared\licensing\config\mappings\2008.08.Mappings.map. Here is a listing to help you identify which license feature codes correspond to which modules you own.
aaiaasap = IMAGINE Subpixel Classifier
aaidq = IMAGINE DeltaCue
adeent = ERDAS ADE Enterprise
aderem = ERDAS ADE Remote
agfa = FeatureAssist for ArcGIS
agiae = Image Analysis for ArcGIS
agmv = ERDAS MulitView for ArcGIS
agsae = Stereo Analyst for ArcGIS
agted = ERDAS Terrain Editor for ArcGIS
apadvan = ERDAS APOLLO Advantage
apessiws = ERDAS APOLLO Essentials -- Image Web Server
apesssdi = ERDAS APOLLO Essentials -- SDI
apollolev1 = ERDAS APOLLO Server Express -- 1 to 2 cores
apollolev2 = ERDAS APOLLO Server Standard -- up to 4 cores
apollolev3 = ERDAS APOLLO Server Professional -- up to 8 cores
apollolev4 = ERDAS APOLLO Server Enterprise -- up to 16 cores
approf = ERDAS APOLLO Professional
eaimlev1 = ERDAS APOLLO Image Manager Express -- 1 to 2 cores
eaimlev2 = ERDAS APOLLO Image Manager Standard -- up to 4 cores
eaimlev3 = ERDAS APOLLO Image Manager Professional -- up to 8 cores
eaimlev4 = ERDAS APOLLO Image Manager Enterprise -- up to 16 cores
eate = eATE Workstation
eateengine = eATE Engine
espengine = ERDAS Spatial Processing Engine
fcms = FCMS Sensor Control
fcmsguid = FCMS Flight Guidance
fcmsr = FCMS Sensor Remote Control
fpes = FPES (Flight Planning & Eval. Software)
gapm = G APM
gblackout = G BlackOut
gdsm = G DSM
geo01 = ATCOR2 Module by GEOSYSTEMS
geo02 = EDBS Module by GEOSYSTEMS
geovault = GeoVault
ggeoref = G Georef
gipaspro = G IPAS Pro
giviewer = G Image Viewer
glapm = G Light APM
gmeasure = G Measurement
gortho = G Ortho
gpro = GPro Core
gproapm = GPro APM
gproapmnode = GPro APM Node
gprogeoref = GPro Georef
gprorect = GPro Rectify
gprorectnode = GPro Rectify Node
gquickview = G QuickView
gsatcor2 = GEOSYSTEMS ATCOR2 Module
gsatcor3 = GEOSYSTEMS ATCOR3 Module
gstereo = G Stereo
ieelev1 = Image Extraction Engine Express -- 1 to 2 cores
ieelev2 = Image Extraction Engine Standard -- up to 4 cores
ieelev3 = Image Extraction Engine Professional -- up to 8 cores
ieelev4 = Image Extraction Engine Enterprise -- up to 16 cores
imadvan = IMAGINE Advantage
imagizer = IMAGIZER Data Prep
imathauth = ERDAS Virtual Explorer Architect
imathdvd = ERDAS Virtual Explorer DVD
imathlds = ERDAS Virtual Explorer Server
imathldsc = ERDAS Virtual Explorer Collaboration
imathldsce = ERDAS Virtual Explorer Collaboration (Enterprise)
imathldssu = ERDAS Virtual Explorer Connections
imathldsu = ERDAS Virtual Explorer Enterprise
imathproa = ERDAS Virtual Explorer Pro Client
imatm = LPS ATE
imautosync = IMAGINE AutoSync
imbing = Bing Maps for ERDAS IMAGINE
imblock = LPS Core
imccd = IMAGINE Coherent Change Detection
imcom = Image Compressor 1GB
imcom10 = Image Compressor 10GB
imcom100 = Image Compressor 100GB
imcomun = Image Compressor Unlimited
imdinsar = IMAGINE D-InSAR
imdpm = IMAGINE Defense Productivity Module
imeasytrace = IMAGINE Easytrace
imess = IMAGINE Essentials
imfeature = IMAGINE Feature Interoperability
imfx = IMAGINE Objective
imgeqlzr = ImageEqualizer
imgrv = IMAGINE Global Retriever
imhifi = Stereo Analyst for ERDAS IMAGINE
imifsdem = IMAGINE SAR Interferometry
immap2pdf = MAP2PDF for IMAGINE
immospro = ERDAS MosaicPro
immpeg = MPEG Patent Support
immrsid500 = IMAGINE MrSID Desktop (500M Max)
immrsidunl = IMAGINE MrSID Workstation (Unlimited)
imnitf = IMAGINE NITF 2.0
imnitf21 = IMAGINE NITF 2.1
imordr = IMAGINE OrthoRadar
imoredit = IMAGINE Enterprise Editor
imorload = IMAGINE Enterprise Loader
improf = IMAGINE Professional / ERDAS ER Mapper
imradar = IMAGINE Radar Interpreter
imrdrdem = IMAGINE StereoSAR DEM
imspmode = Spatial Model Engine
imvect = IMAGINE Vector
imvirtual = IMAGINE VirtualGIS
ipasabs = IPAS-ABS
ipascal = IPAS Cal
ipasco = IPAS CO
ipaspro = IPAS Pro
iwslev1 = IWS Express -- 1 to 2 cores
iwslev2 = IWS Standard -- up to 4 cores
iwslev3 = IWS Professional -- up to 8 cores
iwslev4 = IWS Enterprise -- up to 16 cores
iwsotdf = IWS Optimized Tile Delivery Format
lidarimp = LIDAR Import
lpsste = LPS Stereo
lpsted = LPS Terrain Editor
oaexchange = Ortho Accelerator Data Exchange
oarect = Ortho Accelerator Rectify
orism = ORIMA DP-M
oristb = ORIMA DP-TB
oristegp = ORIMA DP-TE/GPS
procart = PROCART for MicroStation
procart_pm = PROCART for PowerMap
prodpw = PRO600 Drivers for MicroStation
prodtm = PRODTM for MicroStation
prolps_pm = PROLPS Driver for PowerMap
socapm = SOCET SET APM
titangeohub = ERDAS APOLLO Collaboration
titanmaster = ERDAS APOLLO Collaboration Registry
titanwebcache = ERDAS APOLLO Collaboration Web Cache