Search in a TEXT File

Hello friends,

I have one TEXT file that I use to log download information from website.
The file will have unique Login ID for the downloads. When the user will
come for next time for download the LOG entry should go under the same
section (same ID number) so for this I need to search the text file for the
ID and if the ID is found the program should append the NEW LOG entry to the
end of Section. (section mark can be a line of ***** ) (mean just before the
***** line)

How can I do that using ASP (vbs). Please guide me.

Regards
Prabhat