the T42 does not have WiFi, instead it facilitates internet connection via 16 BIT & 32 Bit PCMCIA slot to install a WiFi card , in order to go on the internet.
The ThinkPad uses the following adapters: v 360, 365X, 380, 600: 16-Bit PCMCIA v T20, T22, T23: 32-Bit CardBus and MiniPCI v T23: 32-Bit CardBus and MiniPCI Daughter Card v T30: 32-Bit CardBus and LAN on Planar Board (LOB) v T4x: 32-Bit CardBus and LAN on Planar Board (LOB). 16- and 32-Bit PC Card adapters are configured during ThinkPad initialization. Network Interface Controller data rates are: v For Token Ring: 4/16 MBps v For Ethernet: 10 Mbps...........16 bit PCMCIA 10/100 Mbps.......32 bit CardBus 10/100 Mbps.......MiniPCI and Daughter Card 10/100 Mbps.......T3x and T40 LOB 10/100/1000 Mbps..T42 LOB The MiniPCI Ethernet adapter is accessed behind a removable plate located on the bottom of the ThinkPad directly above the Model/Type S/N sticker. For T20 and T22, the MiniPCI adapter may be an Ethernet/Modem combination card. The Daughter Card (T23) is secured with two screws and is located next to the MiniPCI modem adapter.
please go to this link to read the manual -- it will explain the features for this ThinkPad of various series T42 model-type .
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