Add Your Own S/W IV - Emulation
    OpenBSD emulates Linux, other-BSD and UNIX binaries
    Fast kernel implementation (system call switch)
    Needs appropriate userland libraries
        Packages for installing Linux and FreeBSD libs
    Works: Corel WordPerfect, Netscape Communicator, Applix OfficeWare
        (Star Office?) (Adobe Framemaker?)
    Directory Tree:
        /emul/linux/{etc,lib,usr,...}
        /emul/freebsd/{etc,lib,usr,...}
    Reference: man compat_linux, man compat_bsdos, etc.