This is the info I was looking for.  While it does change the DNS search 
order for nslookup, it does not appear to do so for other utilities like 
ping and rdesktop.

Charles Trevor wrote:
> Brian Morton wrote:
>> You are correct about my setup.  It is as you described it with the 
>> DNS forwarder).  However, it seems that nslookup on Windows XP gives 
>> up when it tries to find the hostname on the first DNS server 
>> (primary local DNS, provided by my ISP, Speakeasy).  It doesn't 
>> subsequently try my secondary local or primary PPTP (m0n0wall).  If I 
>> manually specify
>>
>> nslookup <remote NetBIOS hostname to try> 192.168.0.1
>>
>> where 192.168.0.1 is my m0n0wall address, it succeeds.  However, the 
>> XP networking stack doesn't seem to have the sense to do this on its 
>> own.
>
> Brian,
>
> You might find the article her of use. I have experienced similar 
> problems with XP and this helped me.
>
> http://support.microsoft.com/kb/311218/en-us
>
> Charlie
>