saving a text file

[Jan Rienyer Gadil]

any idea how to automatically save to a text file?
here's what the program do:

first, data is read from the serial port every fixed lenght of time
the data will then be put to a table,
now, every serial read, a table will be created for the data that will
be gathered (one window for each table)
to avoid showing in too many windows, each table will be automatically
saved as a txt file after every 5 tables created.
the txt file will be named after the time it was taken (say from the
system clock)

thanks for your help and more power...