Interp runs ahead of motion. This test checks various state after aborting a program that switches coordinate systems within the program. Interp's state must be synched from the status channel after an abort. If this breaks, MDI command motion, mode line settings and system parameters will follow interp's idea of state, which is probably that where the program had run to a queue buster or to exit, whichever comes first, whereas preview DROs and origin will match the status channel's idea of state, which is that of the running program just prior to the abort. This test runs a program that starts in G55 and aborts during a slow move; were the program to continue, it would switch to G56 before hitting a queue buster. Before program run, coordinate systems are given distinct settings so that after aborting, status channel and interp offsets can be checked in various ways.