Windows® Internals, Sixth Edition, Part 1

Unified Background Process Manager

Various Windows components have traditionally been in charge of managing hosted or background tasks as the operating system has increased in complexity in features, from the Service Control Manager described earlier to the Task Scheduler, the DCOM Server Launcher, and the WMI Provider—all of which are also responsible for the execution of out-of-process, hosted code. Today, Windows implements a Unified Background Process Manager (UBPM), which handles (at least, for now) two of these mechanisms—the SCM and Task Scheduler—providing the ability for these components to access UBPM functionality.

UBPM is implemented in Services.exe, in the same location as the SCM, but as a separate library providing its own interface ...