Single-steps through instructions in processes of the parallel program. If this command is used when a process reaches a function call, the debugger executes this function, but pauses after the function returns. This command can be applied only to the processes, which belong to green cursors. In general there may be several green cursors and processes belonging to different cursors may have different next instructions. So when you command Step over, the processes belonging to different cursors may step through different instructions. Remember that you can always make a part of green cursors amber.