Mobile in general. At one point, I tried setting up Syncthing to be able to manage files remotely for vlc, but android wouldn’t let the two programs access the same space with read/write permissions.
Last week, I was trying to convert a video and the program(FFShare) wouldn’t tell me where it was even saving the file to.
The energy would come from the trolley. The people would launch out at approximately the same speed as the trolley interacts with them and the trolley would slow down in response to how much kinetic energy was transferred to the people.