I have a few words of warning about that install tut. I'ev been messing with it quite a lot and am already on my 6th install. It only takes about 15 mins for the install, but its a VERY bare system.
Here are some things you will need to consider.
1. Read up on apt-get and apt-cache... in fact all apt functions

2. read up on dpkg. You will definitely need dpkg -i blah.deb and dpkg -l | more
3. i dont have a internet connection for my laptop (yet) so ihad to install most things from cd. Good command to know is how to mount the bloody cd (and then unmount it).
Its: mount -t iso9660 /dev/cdrom /mnt/cdrom This will only work if /mnt/cdrom directory actually exists.. So make it if its not there.
umount /dev/cdrom will unmount it.
4. You will need to install the 'make' command. (apt-get install make) and also the automake command (which is useful in some cases).
5. You will need to install: gcc, g++, python, perl (whihc i think auto isntalls if you do the others first).
6. if you are connected to internet apt-get fluxbox. Otherwise you will need to grab it seperately from a cd (as i had to).
7. Install x window system. This has to be done before you can install any window manager.
Make sure you know the exact specifications of ur comp, ie, vid card, monitor etc etc8. I had problems with my install of fluxbox and my setting arent exactly correct. here are some excerpts from things i found which are useful to know.
(I like to cut and paste into my own chan for notes

)
Anywyas, those tips will come in handy for when you recognise what it could be used for.
You will be pulling your hair out with installs of software. There are always shitload of prerequisites which, withthe fact i am not connected to the net, compound the matter cos i cant use apt-get to just grab from the net. I have to lookup/download/burn/install everythign manually. Real pain.
Another great resource for basic things is:
http://www.newtolinux.org.uk/tutorials.shtml Talks about installs, vi editor etc etc.
Also i suggest signing up with linuxquestions.org and using the search button extensively!
About ur question, at one stage in the installation it asks for a ppp connect (modem) and such, so it should detect ur modem.
I hope i have helped more than i have confused. Any more questions about the ery basic stuff i'll gladly try and answer. There are some real linux gurus on this board who will bea ble to give you more indepth answers also!