You need a Linux Box (486 or, better, a Pentium 100+ with 16MB+ ram), the Wireless network card, an antenna (see par 2.2). You need the same on the other end (with Win9x or WinNT, if you prefer...) cause you have to simulate a communication!
If you don't find even here you probably have to wait or to convert a Windows driver to a Linux driver!! (good luck!).
After that, you have to recompile your kernel, recompile your pcmcia source (if need by the Wireless card), finally recompile your Wireless driver. That is the generic situation, maybe for some card you have to perform step 3 only or 1 and 3, it depends on specific driver.