Packages
What are packages?
Packages are the binary equivalent of the ports, prebuilt by the OpenBSD team for your convenience. Though there are far less prebuilt packages than there are ports available through the ports system in /usr/ports.
Installation of a package
If you don’t have them stored locally, packages can be found online in a directory on a FTP mirror site. Something like ftp-site/pub/OpenBSD/2.8/packages/i386/ for instance.
Installation from harddisk:
pkg_add tcsh-6.09.00.tgz
Of course, you could also install via the internet:
pkg_add ftp://ftp-site/url/tcsh-6.09.00-static.tgz