What is the Driver Chain Manager?
Driver Chain Manager (DCM) is a result of a joint project involving Ai Squared, Dolphin Computer Access, Freedom Scientific, GW Micro and Microsoft®. DCM is a set of helper libraries that implement rules about how multiple DDI interceptors cooperate with each other on Microsoft® Windows® NT™ version 4, Windows 2000, Windows XP and any other Windows operating system that supports DCM. Note: Driver chaining is generally not a recommended approach because a driver is never meant to be replaced or modified, and DDI calls are not meant to be intercepted. Having multiple chained drivers compounds an already complex situation. At present, however, the screen reader and magnifier vendors do not have an alternative way to get full information about what is drawn on the screen. DCM was created to reduce the errors caused by driver chaining. The DCM helper libraries essentially manage the reading and writing of information in the registry about how chain drivers are chained onto each other and ev
