Kathy,
I connected to this thread because you responded to a thread regarding must moves at the Wynn on the B&M forum. Overuse of must moves is one of my favorite rants and it usually grabs my attention among these 57 odd forums.
Anyway, years ago I played Planet Poker when it was the only online game in town. Turns out they used a single seed into their RNG based on an offset from the atomic clock. In addition, their shuffling algorithm was very shoddy and published online. A computer security company saw this and quickly created software to show every darn card your opponents held (after about a ten minute tune up). They actually had a clip that made it to CNN and at one point contacted me for my input (as to whether I thought I was cheated).
Turns out there were people cheating and PP refunded me about $340.
Today the shuffling algorithms are much better and the seeds into the RNGs are far more complex (essentially based on user entropy, e.g. where in a 50x100 pixel box you click call/fold/raise) . But that doesn't mean you don't have anything to worry about.
For a well thought through article regarding online problems read former 2+2 author Ed Miller aka the NPA's
blog.
~ Rick