Parallel worlds started as a plot device in science fiction. The idea is that every possible decision in the stream of history actually went every possible way, and that all of those possibilities still exist as part of a multiverse. This is one of the classic versions of alternate history.
Of course, this is a fertile source of plots. One classic science fiction series is the Time Police series by H. Beam Piper, including such stories as Lord Kalvan of Otherwhen. In the DC Comicssuperhero universe during the Silver Age of comic books, it was established the setting is a multiverse with an infinite number of dimensions of that contain various versions of superheroes. This concept was abandoned in the mini-series Crisis on Infinite Earths, but a variant of the concept was recently revived.
In fantasy fiction, the premise of characters arriving in a parallel world is a popular premise. It allows for the kind of adventures in exotic lands like stories like The Prisoner of Zenda and the John Carter of Mars series portrayed before increasing knowledge in geography and astronomy respectively rendered them unbelievable.
In science, the Many Worlds Interpretation of Quantum Mechanics employs a similar idea. This is often seen as providing a method of reconciling the paradoxical aspects of time travel as predicted by general relativity using the probabilistic nature of quantum mechanics. (However, it should be noted that time travel in general relativity requires such things as matter with negative mass, which has never been observed, so it may be that time travel is impossible and thus there are no paradoxes to be resolved).
If the parallel port is integrated to the motherboard (like in many new computers) repairing damaged parallel port may be expensive (in many cases it it is cheaper to replace the whole motherborard than repair that port).
Parallel Port Debug Tool at http://www.beyondlogic.org/pardebug/pdebug.htm is a handy DOS utility when debugging devices connected to the Parallel Port.
This parallel port type also implemented the same three registers as used by SPP for the control and monitoring of the data and handshaking lines; these are the data port, status port, and control port.
Parallelworlds will require a suspension of disbelief, like all fiction, but it needs to have some background in order to make it real.
The believable premise in Star Trek wasn't the transporter accident that sent Kirk to the parallel world--that was the catalyst--it was that the Enterprise was in uncharted territory, making new discoveries, with each of those discoveries altering the way the human race understands the universe.
That parallel universe was yet another discovery, equally as fantastic as the ones the Enterprise made before and after.
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