INF driver installation

Hello,
at first I'd like to introduce myself as a software developer[1]. By
now I have a new challenge to install driver files for an USB2SER
changer on W2K and XP.
1.) Installing drivers for the bus
2.) Installing drivers for the port
3.) Set up modem in the system settings with the given COM port from 2.).

I'm not really familar with developing and installing drivers, but I read
in the MSDN about the DIFxAPI[2] and the installation of existing
drivers works fine, even when the drivers are modified and due to the
modification unsigned (WHQL).

But now I'm wondering about some things during the installation:
1.) How recognizes Windows the hardware, when the USB device is plugged in?
2.) Is there a serious documentation about INF files and the usage?
3.) How could I perform the installation of the modem in the system
settings?

BTW: Sorry about my simple English, but I'm a German developer.

PS: I sent this posting also in m.p.d.d.drivers[3]

TIA Alex

[1] VC++ and C#, developing GUI apps for MS Windows
[2] http://msdn2.microsoft.com/en-gb/library/ms790272.aspx
[3] nttp://1syvkev5i0co5.dlg@alexander-sailer.my-fqdn.de
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