I have managed to connect a DG834GT to another DG834GT but only with wireless security switched off. (Obviously NOT a recommended solution, although you could setup and Access control list that will only allow specific MAC addresses to connect to your network wirelessly)
I have seen posts that state that WPA cannot be used with WDS, i have tried to use WEP at both 64 and 128 (open and automatic), no joy.
First of all i upgraded the firmware, available at Netgear. Once upgraded you will have an advanced wireless settings menu. Knowledge base article click here will explain how to do this.
If anyone finds out how to connect these securely, please let us know.