session.save_path

I am reading a book that refers to changing the value of an option in my php.ini file. I am using a virual server running FreeBSD which already has PHP4 installed and I assume they opted not to install it using the php.ini option, hence it does not exist. It is installed as an Apache module, therefore I assume that I add any options and their values to the httpd.conf file. Anyone disagree with me on this? Now to my real question, this book I am reading suggests that I change the value of "session.save_path" from the default "/tmp" to be "/Windows/temp". I am assuming that this "session.save_path" option saves session information on the end users computer in the directory specified. If this is the case, and I do specify "/Windows/temp" won't this cause problems for people who are not browsing my site with a Windows machine? If so, is there a way to save session information just cookies are saved by going to the default location for cookies so that all platforms are compatible? Thank you in advance, Jonathan Duncan