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[MisterX]

I was unable to because there is no bridge file.

[Nibbler]

This is correct, there is no bridge file.

[MisterX]

Do you have any documentation on crafting bridge files?

If all they need to do is share cookies I would assume it would be possible?

[Joachim Müller]

No, there is no documentation on bridge file creation. I suggest taking a look at the smf bridge file (because Yabb SE used to be the ancestor of SMF) to come up with a bridge file of your own. However, I'd recommend upgrading your YaBB SE.
However, if you're actually running YaBB (and not YaBB SE), then you're probably out of luck: YaBB was not database-driven as far as I know, so bridging will be harder (or even impossible). Bridging is not just a matter of sharing cookies - there are other things to be taken into account: when bridged, coppermine needs to figure out your users and groups by running queries against the database tables of the app you're bridging with. You can't do that with a flatfile forum like YaBB.
Bottom line: I'd rather look into getting a new BBS, preferably one with existing bridging support.

[MisterX]

The matter of determing which user is logged in doesn't necessarily need to be pulled from a database. Maybe there's some feature I have not looked at yet in Coppermine which requires more information other than that.

Anyway - thanks for the timely response.