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Type 1 (TokenElevationTypeDefault) is used only if UAC is disabled or if the user is the built-in Administrator account or a service account . This type does not generate a UAC prompt . Type 2 (TokenElevationTypeFull) is used when the application requires (and is granted) elevated privileges . This is the only type that generates a UAC prompt . This type can also be generated if a user starts an application using RunAs, or if a previously elevated process creates a new process . Type 3 (TokenElevationTypeLimited) is used when the application runs using standard privileges . This type does not require a UAC prompt .

Note that many events with Event ID 4688 won t be applications started by the user . Most of these events are generated by background processes and services that require no interaction with the user . To find the most interesting events, filter the Security Event Log using

Event ID 4688 . Then, use the Find tool to search for the phrase TokenElevationTypeFull . For information about using Event Viewer, read 21, Maintaining Desktop Health .

Besides security auditing (which is not enabled by default), UAC provides two additional logs within Event Viewer:

Allow All Substring Searches (Slow)

Applications and Services logs\Microsoft\Windows\UAC\Operational Logs UAC errors, such as processes that fail to handle elevation requirements correctly Applications and Services logs\Microsoft\Windows\UAC-FileVirtualization \Operational Logs UAC virtualization details, such as virtualized files that are created or deleted

If you are experiencing a problem and you think it might be related to UAC, check these logs for any related information .

To receive the security benefits of UAC while minimizing the costs, follow these best practices:

All .NET Framework applications are created with a single thread, which is used to execute the application. In smart client applications, this thread creates and manages the user interface (UI) and is called the UI thread. You can use the UI thread for all processing, including Web service calls, remote object calls, and calls into a database. However, using the UI thread in this way is generally not a good idea. In most cases, you will be unable to predict how long a call to a Web service, remote object, or database will take, and you may cause the UI to freeze while the UI thread waits for a response.

Leave UAC enabled for client computers in your organization . Have all users especially IT staff log on with standard user privileges . Each user should have a single account with only standard user privileges . Do not give users accounts with administrative privileges to their local computers . If you follow this guideline, you should also disable the UAC elevation prompts as described in the section titled How to Configure User Account Control earlier in this chapter . Domain administrators should have two accounts: a standard user account that they use to log on to their computers, and a second Administrator account that they can use to elevate privileges . Admin Approval Mode can slow down administrators by requiring them to frequently confirm elevation for administrative tools . If your administrators use a standard user account for day-to-day privileges and only log on with an Administrator account when managing a computer, your IT department might be more efficient if you disable the elevation prompt . To do this, configure the UAC policy setting Behavior Of The Elevation Prompt For Administrators In Admin Approval Mode to Elevate Without Prompting . However, changing this policy may increase the security risk in your environment, and the Windows Security Center will report it . Train users with local administrator credentials not to approve a UAC prompt if it appears unexpectedly . UAC prompts should appear only when the user is installing an application or starting a tool that requires elevated privileges . A UAC prompt that appears at any other time might have been initiated by malware . Rejecting the prompt will help prevent the malware from making permanent changes to the computer .

section, Setting Up Referrals, for details.)