I'm not sure where to put this question, nor quite how to search for the answer here, so I'm posting it here with the hopes that someone will lead me in the correct direction.
Currently I have wordpress set up in a subdirectory (http://www.domain.com/blog). I have another subdirectory that I would like people to log into in order to see (http://www.domain.com/secret). Essentially, I would like one common login (i.e. the wordpress login system) for the blog and for the secret directory (among potentially other subdirectories and pages). What is the best way to do this?