How to Add a Windows SharePoint Web Service Reference

You can add a Web reference to each SharePoint Web service
through your Visual Studio .NET IDE. In your Solution Explorer, 
right-click on your project and select "Add Web Reference"
from your popup menu.
The table below shows the URLs to use for each Web service provided by WSS.
Enter the URL to the Web service and click the Go button.
This will show you a summary of all available Web methods in the dialog box.
Next, enter the name of the Web reference and then click Add Reference.

WSS Web Services	Web Reference
Administration Service	http://[server-url:port-number]/_vti_adm/admin.asmx
Alerts Service	http://[server-url]/_vti_bin/alerts.asmx
Document Workspace Service	http://[server-url]/_vti_bin/dws.asmx
Forms Service	http://[server-url]/_vti_bin/forms.asmx
Imaging Service	http://[server-url]/_vti_bin/imaging.asmx
List Data Retrieval Service	http://[server-url]/_vti_bin/dspsts.asmx
Lists Service	http://[server-url]/_vti_bin/lists.asmx
Meetings Service	http://[server-url]/_vti_bin/meetings.asmx
Permissions Service	http://[server-url]/_vti_bin/permissions.asmx
Site Data Service	http://[server-url]/_vti_bin/sitedata.asmx
Site Service	http://[server-url]/_vti_bin/sites.asmx
Users and Groups Service	http://[server-url]/_vti_bin/usergroup.asmx
Versions Service	http://[server-url]/_vti_bin/versions.asmx
Views Service	http://[server-url]/_vti_bin/views.asmx
Web Part Pages Service	http://[server-url]/_vti_bin/webpartpages.asmx
Webs Service	http://[server-url]/_vti_bin/webs.asmx