APP_USER_DIR - Provides access to the application user directory.
APP_USER_DIR_QUERY - Locates existing application user directories.
ARG_PRESENT - Returns TRUE if the value of the specified variable can be passed back to the caller.
BREAKPOINT - Sets and clears breakpoints for debugging.
BYTEORDER - Converts between host and network byte ordering.
CALL_FUNCTION - Calls an IDL function.
CALL_METHOD - Calls an IDL object method.
CALL_PROCEDURE - Calls an IDL procedure.
CATCH - Declares and clears exception handlers.
CPU - Changes the values stored in the read-only
CREATE_STRUCT - Creates and concatenates structures.
COMPILE_OPT - Change default rules for compiling routines.
DEFINE_KEY - Programs keyboard function keys.
DEFINE_MSGBLK - Defines and loads a new message block into the current IDL session.
DEFINE_MSGBLK_FROM_FILE - Reads the definition of a message block from a file, and loads it into the current IDL session.
DEFSYSV - Creates a new system variable.
EXECUTE - Compiles, executes IDL statements contained in a string.
EXIT - Quits IDL and exits back to the operating system.
EXPAND_PATH - Expands path-definition string into full path name for use with the
HEAP_FREE - Recursively frees all heap variables referenced by its input argument.
HEAP_GC - Performs "garbage collection" on heap variables.
IDL_VALIDNAME - Determines whether a string may be used as a valid IDL variable name or structure tag name.
IDLITSYS_CREATETOOL - Creates an instance of the specified tool registered within the iTools system.
ITCURRENT - Set the current tool in the iTools system.
ITDELETE - Deletes a tool in the iTools system.
ITGETCURRENT - Gets the identifier of the current tool in the iTools system.
ITREGISTER - Registers tool object classes with the iTools system.
ITRESET - Resets the iTools session.
ITRESOLVE - Resolves all IDL code within the iTools directory, as well as all other IDL code required for the iTools framework.
KEYWORD_SET - Returns True if given expression is defined and nonzero or an array.
LMGR - Determines the type of license used by the current IDL session.
MESSAGE - Issues error and informational messages.
N_ELEMENTS - Returns the number of elements contained in an expression or variable.
N_PARAMS - Returns the number of non-keyword parameters used in calling an IDL procedure or function.
N_TAGS - Returns the number of tags in a structure.
OBJ_CLASS - Determines the class name of an object.
OBJ_DESTROY - Destroys an object reference.
OBJ_ISA - Determines inheritance relationship of an object.
OBJ_NEW - Creates an object reference.
OBJ_VALID - Verifies validity of object references.
ON_ERROR - Designates the error recovery method.
ON_IOERROR - Declares I/O error exception handler.
PATH_CACHE - Controls IDL's path caching mechanism.
PTR_FREE - Destroys a pointer.
PTR_NEW - Creates a pointer.
PTR_VALID - Verifies the validity of pointers.
PTRARR - Creates an array of pointers.
RECALL_COMMANDS - Returns entries in IDL's command recall buffer.
REGISTER_CURSOR - Associates a given name with cursor information, used in conjunction with IDLgrWindow::SetCurrentCursor.
RESOLVE_ALL - Compiles any uncompiled routines.
RESOLVE_ROUTINE - Compiles a routine.
RETALL - Returns control to the main program level.
RETURN - Returns control to the next-higher program level.
ROUTINE_INFO - Provides information about compiled procedures and functions.
SETUP_KEYS - Sets function keys for UNIX versions of IDL.
STOP - Stops the execution of a running program or batch file.
STRMESSAGE - Returns the text of a given error number.
STRUCT_ASSIGN - Uses "Relaxed Structure Assignment" to copy structures.
STRUCT_HIDE - Prevents the IDL HELP procedure from displaying information about structures or objects.
SWAP_ENDIAN - Reverses the byte ordering of scalars, arrays or structures.
SWAP_ENDIAN_INPLACE - Reverses the byte ordering of scalars, arrays or structures. Differs from the SWAP_ENDIAN function in that it alters the input data in place rather than making a copy.
TAG_NAMES - Returns the names of tags in a structure.
TEMPORARY - Returns a temporary copy of a variable, and sets the original variable to "undefined".
WAIT - Suspends execution of an IDL program for a specified period.