Microsoft KB Archive/923966

= The pen service does not exclude certain HID digitizers on a Windows XP Tablet PC Edition 2005-based Tablet PC =

Article ID: 923966

Article Last Modified on 11/29/2007

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APPLIES TO


 * Microsoft Windows XP Tablet PC Edition 2005

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SYMPTOMS
On a Windows XP Tablet PC Edition 2005-based Tablet PC, you install the pen service (Wisptis.exe). The pen service does not exclude certain human interface device (HID) digitizers.

This behavior affects some custom digitizers that do not belong to the input devices for the pen service. These digitizers may become unavailable. Therefore, the pen service may prevent the custom application from using the custom devices.



CAUSE
In the current implementation of the Wisptis.exe process, the pen service assumes that any HID that has a top-level collection belongs to the pen service if the top-level collection specifies a usage page for the digitizer.

Note The top-level collection specifies that the usage page for the digitizer is 0x0d.



RESOLUTION
A hotfix is available to change this behavior. This hotfix updates the pen service. The new version of the pen service excludes all HID digitizers that do not have a usage page for the following elements:
 * Digitizer
 * Lightpen
 * Pen
 * TouchScreen

After you apply this hotfix, the pen service enables independent hardware vendors (IHVs) to exclude specific devices that have a usage page for Digitizer and for Pen. The devices can be excluded according to vendor IDs and according to product IDs.

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows XP service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
The following list contains prerequisites for the hotfix:
 * Windows XP Tablet PC Edition 2005 Service Pack 2

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace a previously released hotfix.

Registry information
To use one of the hotfixes in this package, you do not have to make any changes to the registry.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows XP with SP2, x86-based versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbexpertiseadvanced kbfix kbqfe kbhotfixserver KB923966

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