SSF When you're serious about password protection. But don't take our word for it, ask our CLIENTS! WHO CAN USE SSF? SSF was developed on Solaris (SUN OS) and mostly done in C. Some of the interface utilities were done in PERL. It uses the Apache standard password file, and can also adapt to any known web-server. So far SSF has been installed on BSD, BSDi, Linux, HP-ux, SGI, Solarix-x86 and Solaris-Sparc. Installation on other UNIX servers is also possible. SSF currently does not run on Windows NT web servers or MAC's.