I am wondering how I would go about making it so that people can login to my IPB forum on my site from another part of my site using a seperate form I guess you could say. Also once they're signed in, I could check that they're signed in and display their username or something like that.
I read everywhere online about SSO, External Scripts, everything and nothing has really helped me.
I'm still stuck and confused, does anybody have any ideas?
You would want IPS.Connect. It is built into the 3.4.x backend and is designed specifically to support logging in from other applications and installs of IP.Board 3.4.x or above.
It uses a master and slave structure to determine which database will store the real database and which is storing a temporary cache of the real one.
Documentation is found on their website; http://www.invisionpower.com/support/guides/_/advanced-and-developers/integration/ips-connect-r27
While the question is a bit old I hope it can be of assistance to somebody in the future.