This is the beginning of a collection of user-defined
functions which may be added to VAX-DATATRIEVE.  At the present time
it contains a contribution by Phil Naecker that adds some VMS System
Library functions and Run Time Library (MTH$---, LIB$---, and
FOR$---) routines to VAX-DATATRIEVE, including the much-desired 

SPAWN - Create a subprocess, and
FN$STR_LENGTH - Length of a string

other functions included are:

FN$CLEAR_BIT - Clear a bit in a longword
FN$SET_BIT - Set a bit in a longword
FN$TEST_BIT - Test a bit in a longword
FN$DEFINE_LOG - Define a logical name
FN$FAO         - Formatted ASCII Output
FN$LOG - Common Logarithm  (Synonym for FN$LOG10)
FN$MAX - Maximum of two longwords
FN$MIN - Minimum of two longwords
FN$POWER - Raise a real number to a real power
FN$SET_DEFAULT - Set Default Directory
FN$STR_FIRST_CHAR - ASCII value of first string character
FN$STR_REPLACE - String replace
FN$STR_TRANSLATE - String translate
FN$STR_EBCDIC_TO_ASCII - Translate EBCDIC to ASCII
FN$STR_ASCII_TO_EBCDIC - Translate ASCII to EBCDIC