Yes, a visitor can be part of more than one campaign, and this frequently occurs. If two campaigns conflict, you can assign them priority, so that when a visitor is part of both, only the one with highest priority will be triggered.

Yes, each campaign defines a segment, and can contain many different content changes/additions to the site. So, essentially each campaign allows you to create a different version/experience of your site for individual audience segments.

Yes, Personyze works in real-time; the moment that someone matches a defined audience segment, they will see the content you have added or changed.

Yes, some targeting parameters are not based on behavior on the site, but are available to be used the moment someone lands. These are those which are in the category referral, and CRM targeting.

Yes, several of the targeting rules work for new visitors, including those which fall under the categories geo-targeting, company/IP, system/device information, landing page, and referral.