This question contains spoilers
In The Thirteenth Floor (1999), we learn that if someone ("a user") logs into a simulated world and controls one of the simulated personalities, there if this person is killed inside the simulation, then the simulated personality will escape to the "real world". In the movie we see that happening 2 times, once when Ashton body of 1999 is invaded by the bartenders character of 1937. Another is at the end of the movie when David's body of 2024 is invaded by Hall's conciseness of 1999.
But there is another time that we don't get to see it. At the beginning of the movie when Fuller's body of 1999 gets killed.
Do we assume that Fuller-1999 is the same one in 2024 (having his conciseness escaped from the simulated 1999)? Maybe because he was killed while no user from 2024 was controlling him. And that makes escaping the simulated 1999 impossible for him, but does that mean that this character can no longer be controlled ever again?