The following items are now obsolete in IDL:

DDE Routines
DELETE_SYMBOL
DELLOG
DEMO_MODE
DO_APPLE_SCRIPT
ERRORF
FINDFILE
GET_SYMBOL
GETHELP
HANDLE_CREATE
HANDLE_FREE
HANDLE_INFO
HANDLE_MOVE
HANDLE_VALUE
HDF_DFSD_ADDDATA
HDF_DFSD_DIMGET
HDF_DFSD_DIMSET
HDF_DFSD_ENDSLICE
HDF_DFSD_GETDATA
HDF_DFSD_GETINFO
HDF_DFSD_GETSLICE
HDF_DFSD_PUTSLICE
HDF_DFSD_READREF
HDF_DFSD_SETINFO
HDF_DFSD_STARTSLICE
HDF_VD_GETNEXT
IDLffLanguageCat
IDLgrMPEG
INP, INPW, OUTP, OUTPW
ITCURRENT
ITDELETE
ITGETCURRENT
ITREGISTER
ITRESET
ITRESOLVE
LJLCT
MPEG_CLOSE
MPEG_OPEN
MPEG_PUT
MPEG_SAVE
MSG_CAT_CLOSE
MSG_CAT_COMPILE
MSG_CAT_OPEN
ONLINE_HELP_PDF_INDEX
PICKFILE
POLYFITW
PREF_MIGRATE
REWIND
RIEMANN
RSTRPOS
SET_SYMBOL
SETLOG
SETUP_KEYS
SIZE Executive Command
SKIPF
SLICER
STR_SEP
TAPRD
TAPWRT
TIFF_DUMP
TIFF_READ
TIFF_WRITE
TRNLOG
VAX_FLOAT
WEOF
WIDED
WIDGET_MESSAGE