ISAPI's big promise was better performance and memory usage...ironic that it has now fallen in favor to the biggest performance pig of all web applications...ASP. In an age of fast machines and small web apps, rapid development and ease of use wins out over performance.

ISAPI is hard to learn, harder to get right, unstable, bug ridden (if written in MFC) and surprisingly inflexible.

Look, you're a smart person. You want to do the right thing. You don't need to subject yourself to the torture of learning ISAPI. Only hard-core programmers who are tasked with writing a custom web app that is going to get some VERY heavy traffic should even bother with ISAPI.

So why did I give this book 4 stars? There are no good ISAPI books out there. This one has the most information in it and will allow you the best chance to actually develop something that works. Get this book and hit Genusa's (now dusty) ISAPI site. Also spend a lot of time in the Microsoft knowledge base...there are plenty of workarounds and bugs to learn about too.

Keep in mind that with ISAPI you had better be a damn good programmer. If your DLL ever crashes...bye bye web server. This is harder than you think if you are doing "serious" web programming which includes database access.

Smart managers will not allow mission-critical web apps to be developed in ISAPI by a web punk who has never done this before. Do everyone a favor and get a clue. There is a reason why nobody is doing this stuff anymore!