You could also check the pkg_add(8), signify(1) and ports(7)/packages(7) man pages.
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man1/...
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man7/...
* packages vs. ports[0]
* porter's handbook[1]
[0]: http://www.openbsd.org/faq/faq15.html
[1]: http://www.openbsd.org/faq/ports/index.html
You could also check the pkg_add(8), signify(1) and ports(7)/packages(7) man pages.
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man1/...
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man1/...
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man7/...
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man7/...