Syncing Codeigniter Modules

[eluser]Aakika[/eluser]
I have several codeigniter applications that are separate modules but need to interface with the membership module to:

1. Sync login so member only logs in once and can go to different modules
2. Validate Membership level prior to giving access to priviledges
3. Validate Active subscription
4. Deposit/record information in a part of membership profile
For example, a fundraising module need to record members fundraising activity
blog which is in wordpress need to record blog post or comment in profile

Thanks for your feedback.