My question is not about running programs during development, but after that - such as showing them to friends.
I've read that they can be burned on a standalone CD - but this means that the PS2 it runs on needs a modchip, right?
Are there any other possibilities a program could be run? Such as from a memory card, or directly from the Internet? Anything that doesn't require the console to be tweaked?
Well I'm new myself so not entirely sure. I do know though if you use the SMS iso it boots to a loader that lets you load stuff from your memory card (In my case sms)
But again, you'll need a way to boot the sms disc so a mod chip/exploit will no doubt be needed at some point.