STRIP_PATH()   Strip path and optionally extension from a filespec
 ISVALFILE()    Checks a file name for validity
 FMOVE2PRIOR()  Moves to beginning of previous CRLF delimited line in
                a text file
 FMOVE2NEXT()   Move to beginning of next line in a text file
 FILEINFO()     Returns file date,time,size
 NKEY()         Gets key of an index file
 SFREADLINE()   Reads in text up to the next CRLF in a text file
 WRITEFILE()    Writes a line or lines  to a text file