Just learned of forex trading and have questions

I am an Realtor that only deals with investments. I will work with any type of commercial or residential property to make my clients money. I have strong relationships with many of my clients so I really do guard how I advise them to invest their money. I recently heard of some forex trading program which require about $500k cash to participate in the programs. The spreadsheet I recieved on this stated a 45% (they average 15-75%) return each month and is compounded. What I recieved stated that after 12 weeks of having the money in the trade program the 500k would be worth approx. 4.6M. Is this for real? If so, what kind of risk are involved? This bank claims to stop trading if they lose 2.5% of your investment in one day. This seems to good to be true so I am very skeptical. What questions should I be asking the banks? Also, if this is legit is there other programs with similar returns that require less start up capital just for testing the waters? I would greatly appreciate any help you guys can give.

Thanks!

Yes... these gains are possible...
and Yes there are programs available with as little as $5K and similar returns...

Thanks. Can you tell me what the best ways to verify these programs? Also, can you refer me to the program that I can get those gains with only $5k?