HEAP_NOSAVE - Used to clear the save attribute of pointer or object heap variables.
HEAP_SAVE - Used to query whether a pointer or object heap variable is savable. It can also be used to change the heap variable save attribute.
IDL_Savefile - Object that provides complete query and restore capabilities for IDL SAVE files.
IRESOLVE - Resolves all IDL code within the iTools directory, as well as all other IDL code required for the iTools framework.
JOURNAL - Logs IDL commands to a file.IDL.
RESOLVE_ALL - Iteratively resolves (by compiling) any uncompiled procedures or functions that are called in any already-compiled procedure or function.
RESTORE - Restores IDL variables and routines in an IDL SAVE file.
SAVE - Saves variables, system variables, and IDL routines in a file for later use.