While neither problem was market-related, they nonetheless highlight the fragility of complex and far-reaching global networks and sophisticated computer systems when sudden breakdowns occur or they are overwhelmed by unexpected demand. In other words, no technology is infallible, and investors need to bear that in mind when it comes to looking after their own interests.

Indeed, recent developments call into question such notions as investors will always have ready access to markets, they will be able to execute transactions quickly and efficiently, and they will know just where they stand in financial terms. Such assumptions could prove costly should a technology or communications-related failure occur at an especially inopportune time -- say, for example, when share prices have begun their long overdue correction.

Investors would do well to plan for the unexpected. For example, do you have more than one way -- other than by email, for example -- to communicate with your broker or financial advisor? If not, you should think about whether this is the ideal arrangement going forward. Do you depend on certain hardware or software, or even a steady power supply, to execute trades or monitor investments? If so, you might want to consider some sort of back-up plan. How you invest and what your time horizons are will, of course, dictate your own individual requirements.

Whatever the case, it is important to recognize that the communications and investment technology you count on today may not be there when you need it most.

Michael Panzner is a 25-year veteran of the global stock, bond, and currency markets and the author of Financial Armageddon: Protecting Your Future from Four Impending Catastrophes and The New Laws of the Stock Market Jungle: An Insider's Guide to Successful Investing in a Changing World.