Linksys WDT11 Instant Wireless PCI Adapter, is just an adapter to insert Wireless PCMCIA card into PCI slot.
It does nothing by it self.
What you mean is: D-Link DWL-500 11Mb Wireless LAN PCI Network Card (about $110).
Two Client Wireless Cards can talk one to the other when they are configured as an AD-Hoc configuration.
BTW: You probably thought that you could get two $44 Adapter, and get Wireless connection for $88. Unfortunately it is 2002, by 2003 it may be so ?cheap?.
Your best bet is to find inexpensive USB Wireless Client Adapters. $75-$100. If you are lucky, you will get away with $150 expense.