Single-steps through instructions in processes of the parallel program, and enters each function call that is encountered. If the next statement is a function call, the debugger steps into that function, then pauses execution at the beginning of the function. Can be applied only to the processes that 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 into, the processes belonging to different cursors may single-step through different instructions. Remember that you can always make a part of green cursors amber.