Which p.c. hardware program is identified by the code 00:02:3F:DB:2D:99 ?

That looks like a MAC address for a Network Interface Card.  You can
read all about MAC addresses here:

http://en.wikipedia.org/wiki/MAC_address

If you want to find from which hardware manufacturer this mac address
comes from, you can use http://coffer.com/mac_find/ to do a lookup of
the first 6 digit of the address. In your case, it looks like you have
an network card from Compal Electronics. Keep in ming that MAC address
refers to the network card, not the computer itself

I do indeed thank randomuser-ga and also mal17-ga for making
very helpful suggestions for answering my query.  Martin246-ga