Will FedoraCore1-built binaries run on all Fedora systems?

[Matt England]

Hello,

Will FedoraCore1-built binaries run on all Fedora systems?

ie, will a FC1-build binary also run on FC2, FC3, and FC4?  Does it depend 
on the binary/app and/or library dependencies?

If this does not work for FC1, then are any of the FCx-built binaries 
"forward" compatible?  eg, will a FC2 binary run on FC3 or FC4?

-Matt