For more information about the project itself, please visit our project page devoted to it at http://www.distributed.net/rc5/

Generic answers in this category:
Why are you doing this?
What happens when the key is found?
How will I know if my computer found the key?
What about ITAR?
Why doesn't an FPU make my computer crack RC5-72 faster?
Why are PowerPC-based and (most) Intel-based computers so much faster than other platforms on RC5-72?

Specific RC5-72 answers in this category:
What are the server address and port changes with RC5-72?
Why is RC5-72 slower than RC5-64?
Why do I get "file is not in distributed.net format"?
What minimum client and proxy versions are needed for RC5-72?
Updated client/proxy binaries for my platform are not yet available
Why does the client select the wrong core? (or Why does the client select different cores each time?)