Brian,
Lspci should out put your wireless devices, and there is a list of
supported wireless devices on the debian wiki https://wiki.debian.org/WiFi
Acer TravelMate 4020 has an Intel 2200BG wireless card and is common enough.
The configuration commands for that chipset are available here
https://wiki.debian.org/ipw2200
It should be a relatively painless setup.
, Ron