Does the WHMCS actually bridge?

Hello again,
I'm getting tired so I'm going to ask what may be a dumb question.
Does the WHMCS integration actually bridge the two products??
It seems I have to log into Wordpress and then log into whmcs again. Is there a way to set it so when you log into my site that iyou are logged into WHMCS? That would be a bridge right?
How can I get this doen?

Thanks for all.