Post-purchase questions (warning: photos)

[VX KAT]

Thanks to everyone who has answered my pre-purchase questions, now I have some post-purchase ones (with photos!).

1. How many remotes can the built-in keyless entry system remember? I've got the car with no remotes and had one remote linked to the car thanks to instructions linked/posted by VX_KAT. If I want to activate the second remote, will the first one be forgotten? Assuming the malicious previous owner still has the original remote(s) -- can they still use them?

I recall from the instructions I got, you can program up to 4 remotes, if you program a 5th, the first one gets cleared out.