# Using Internet Authentication Service

You can find the source code for several IAS sample applications in the complete Microsoft Platform SDK. The Platform SDK can be downloaded at http://www.microsoft.com/downloads/details.aspx?FamilyId=A55B6B43-E24F-4EA3-A93E-40C0EC4F68E5.

After you have installed the complete Platform SDK, you can find the IAS samples in the subfolders under the %Install Path%\Microsoft SDK\Samples\netds\IAS folder, where %Install Path% designates the base installation directory of the Platform SDK (for example, C:\Program Files). The names of the subfolders correspond to the names of the following samples.

Sample Description
DialIn This sample implements a RADIUS extension DLL that checks the dial-in bit for the user.
MapName This sample extension DLL searches all trusted domains for the designated account. This allows users from multiple domains to be authenticated without the users having to supply their domain name.