Microsoft KB Archive/250646

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Description of the Modems Key in the Windows 95/98 Registry

Article ID: 250646

Article Last Modified on 1/27/2007


  • Microsoft Windows 98 Standard Edition
  • Microsoft Windows 98 Second Edition
  • Microsoft Windows 95

This article was previously published under Q250646

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry


This article describes the Modem registry key entries in the Windows 95 and Windows 98 registry.


Modem registry keys are stored under the following key:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class \Modem

For each installed modem, Windows 98 creates one registry key (starting with \0000). Each of those keys contain additional subkeys, which contain AT commands that Windows uses to initialize, dial, and answer the modem. Other entries are used for communications and modem drivers.

Subkey specific information can be viewed in the following Knowledge Base articles:

For additional information about the specific registry key information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

250647 Description of the Modem Init key in the Win9x Registry

250648 Description of the Modem Responses key in the Win9x Registry

250649 Description of the Modem Settings key in the Win9x Registry

250650 Description of the Modem Phone Message Record and Playback keys in the Win9x Registry

158474 Windows TCP/IP Registry Entries

250662 Description of the TCP/IP Registry Entries in the MSTCP\ServiceProvider Subkey

250663 Description of the TCP/IP Registry Entries in the NetTrans Subkey


The full set of modem registry keys and the INF file format are documented in the Microsoft Windows 98 Device Development Kit.

Keywords: kbenv kbinfo KB250646