Say I encrypt a file using my private GPG key on my desktop. I then transfer the file to my laptop, and intend to decrypt it. What do I do? I heard something about "exporting a public key", what does this mean? Do I use the private key on my laptop as well? If I do, how do I put the private key from my desktop onto my laptop? I am just transferring encrypted files between my own personal machines, I am not giving them to anyone else, so do I still need the public key?