Question: Is there official documentation on creating an authentication cookie outside of WP?
Scenario: I am planning on utilizing WP v.3 as a CMS for a company's support documentation website. This support CMS is going to be a piece of a larger network of sub-sites. My client does not want to force the user to log-in more than once, so on initial login to the main site (non-WP), we want to create an authentication cookie that WP will recognizes and allows the user to continue on to the site without having to re-log in.
With all that being said, I have search low and high for "official" documentation on how to do this with no avail. Although, I have found pieces throughout the Net that seem like some-what viable options (or hacks), but I would rather use an "official" method to accomplish this.
Can anyone out there point me in the right direction?