Defend themselves? That's a claim that Tron would have wanted to test. Yori wonders how.

"Some people keep cats, I'm sure." Users must--as opposed to the programs written inside computer systems. She lifts a shoulder in discomfort. "It's...a long story." She's only a program, re-writable by anyone with a little time and expertise who chose to try, and she's not sure yet if she wants the people sleeping in her quarters to know that. But she doesn't want to lie to them, either.

In the system, bits might behave a little like cats, from what she's heard. Companions to programs. Not many bits stayed around after the Master Control Program took charge. They couldn't defend themselves that well. "What defenses do cats typically have?"