{
{    Retrieves the value for a specified field.
{
{       AVP$GET_FIELD (FIELD_NAME, DATA_RECORD, DESCRIPTION_RECORD, FIELD_VALUE,
{             TYPE_SPECIFICATION, DEFAULT_VALUE, DESCRIPTIVE_TEXT,
{             UTILITY_INFORMATION, STATUS)
{
{ FIELD_NAME: (input) Name of the field.
{
{ DATA_RECORD: (input) Pointer to the data record containing the field.
{
{ DESCRIPTION_RECORD: (input) Pointer to the description record containing the
{       field.
{
{ FIELD_VALUE: (output) Value of the specified field.
{
{ TYPE_SPECIFICATION: (output) Type specification of the specified field.
{
{ DEFAULT_VALUE: (output) Default value for the specified field.
{
{ DESCRIPTIVE_TEXT: (output) Pointer to the descriptive text for the specified
{       field.
{
{ UTILITY_INFORMATION: (output) Pointer to the utility information for the
{       specified field.
{
{ STATUS: (output) Variable in which the completion status is returned.
{       CONDITIONS:
{             ave$unknown_field
{
