October 26, 1998, VMware filed for a patent on their techniques, which is granted as U.S. Patent 6,397,242 1999 February 8, 1999, VMware introduced VMware Virtual Platform for the Intel IA-32 architecture. 2000 FreeBSD 4.0 is released, including initial implementation of FreeBSD jails IBM announces z/VM, new version of VM for IBM's 64-bit z/Architecture 2001 January 31, 2001, AMD and Virtutech release Simics/x86-64 ("Virtuhammer") to support the new 64-bit architecture for x86. Virtuhammer is used to port Linux distributions and the Windows kernel to x86-64 well before the first x86-64 processor (Opteron) was available in April, 2003.