Solution:
A locking mechanism such as a file lock can be implemented in CPN Tools V4.0.1 to prevent simultaneous writing to the same file. The first process that attempts to write will acquire the lock, while any subsequent processes attempting to write will wait until the lock is released by the first process before they can proceed. This ensures that only one process at a time is able to make changes or write new data into the file, thus preventing any conflicts or inconsistencies due to multiple processes writing concurrently.