Microsoft Knowledge Base Article 318803 contains the following summary:
Windows contains a client-side Domain Name System (DNS)
The client-side DNS caching feature may generate a false impression that
robin" is not occurring from the DNS server to the Windows client
When you use the
command to search for the same A-record domain name,
may use the same IP address.
This behavior is different from Microsoft
operating systems earlier than Windows 2000.
These operating systems do not
include the client-side DNS caching feature.
This article describes how to
disable DNS caching.
Note This article refers to the client portion of DNS. Do not use this information for making changes to DNS servers.