JGridstart/Help/Copy certificate
From PDP/Grid Wiki
When you have more than one computer from which you want to use the grid, you need to copy your certificate and key. This is done by exporting on the computer that has your grid credentials, and importing them on another.
Launch jGridstart
Launch jGridstart from the webpage of your certificate authority (CA). The link may be called manage certificates, launch jGridstart, or the like.
You might need to install something called Java first; if that's the case, a button will pop up that directs you to the Java installation site. Please follow the instructions, and go back to the CA page to launch jGridstart.
You will be asked for permission to run the program, because it requires access to your system. Press Run to continue.