Welcome to the board..
WRITEVALUE is used to write a value to the registry.
WRITELINE is used to write a line to a TEXT file.
WRITEPROFILESTRING is used to write an entry in an INI file.
From what you are talking about, you probably need WRITELINE. A pretty decent example is in the Guide provided with the KiXtart download. Or, you can look at the LOGGER() UDF in the UDF Forum here on this site.
HTH,
Kent
