In 2001, I first discovered Win Scott Eckert's Crossover Chronology. As a crossover fanatic, I was overwhelmed, and read the thing straight through in just a few days.
In 2004, during the era when Powerman was in self-exile, traveling through space, time, and alternate realities. He had been doing so for about a year at this point in the series, but had only been encountering new characters and settings, or familiar ones from within the Super Comics Universe and Multiverse.
But in late 2004, I chose to incorporate the works of Win Scott Eckert's chronology, including all the events and characters, as well as the articles of Wold Newtonry mentioned within the chronology. From 2004 to 2007, Powerman started encountering characters from Win's Crossover Chronology, in the past, present and future. In 2007, Powerman returned home, but over in Super Team-Up, stories continued to involve Powerman teaming with the characters from Win's Chronology.
Last year, the chronology evolved into a two volume book called Crossovers: A Secret Chronology of the World, which was a much expanded version of the online chronology. Of course I ordered the book within minutes of learning it was available for sale. Powerman continues to encounter characters brought in from Win's work, as do other characters like Powerkid and the Wanderer. The chronology is firmly a part of Wronskiverse canon, with a few minor areas where there is a conflict with already established Wronskiverse canon. But those are very, very minor.
Of course, some characters from the chronology were already in. Sherlock Holmes, Dracula, Tarzan, the Lone Ranger, Star Trek, Doctor Who, Superman, Batman, Wonder Woman, Captain America, Law & Order, and some others had already existed in the Wronskiverse long before I discovered Win's site. And it was because of those that I felt so comfortable including his whole chronology.
Of course, just as my inclusion of some elements of the DC Universe doesn't go in reverse, the same goes here. Win's works exist within his Crossover Universe. But his work is so great, that is is considered by Henry Covert of the Wold Newton Meteoric Society to be a key piece of the Wold Newton Universe. Additionally, it is also the what I would consider the Bible for my Television Crossover Universe. So the chronology really exists in at least four realities.