65,535 - that is the limit of unique TCP/IP ports that's currently allowed on most systems (since port number is a 16-bit integer value) If multiple currencies overlap in port numbers, or if future coins use some other mechanism to connect to their peer networks you could always have more, .
In 2007, its founders were ranked as the second most generous philanthropists in America, and Warren Buffett the first. As of May 16, 2013, Bill Gates had donated US$28 billion to the foundation.
Warren Buffett and Bill Gates are leading this effort by example. They are the two richest Americans and they have a combined net worth of more than $156 billion, according to the Bloomberg Billionaire Index. Also according to the index, the two have combined to put more than $46 billion into the Gates Foundation.