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Follow the “Designing for Success” Tips in Appendix C
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Appendix C of this document provides a series of guidelines to help ensure that system and device manufacturers can create new design that are compatible with Microsoft operating systems.
Microsoft recommends that you follow these guidelines as part of the design process, to ensure that you receive news and feedback from Microsoft that can help ensure the success of new designs.
Several types of devices can be designed to migrate functions from peripheral hardware to Windows drivers, saving bill-of-materials costs at the expense of CPU resources. Examples of such devices include soft audio, soft Public Switched Telephone Network (PSTN) modems (V.34, V.90)and soft asymmetric digital subscriber line (ADSL) modems (G.992.2). There are several risks:
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Any soft device may undermine the system, depending on how it uses CPU and system resources.
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Any soft device may be vulnerable to failures or performance issues created by other parts of the system, depending on how other device drivers compete with it for CPU and system resources.
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A combination of soft devices may be much less stable than either device alone.
Requirements for soft modems are in development. These requirements will reference absolute CPU consumption rather than percentages of the available CPU.
Design Guidelines:
Guidelines for WDM-based Software Modems at http://www.microsoft.com/hwdev/modem/softmodem.htmWindows Management Instrumentation: International Support Overview at http://www.microsoft.com/technet/win2000/winigloba.asp
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