A '''virtual machine''' is a program that emulates a machine. The [tclVM%|%Tcl virtual machine] executes Tcl scripts that have been compiled into [bytecode]. ** Tcl Program Virtual Machines ** [tclVM%|%Tcl virtual machine]: a component of [the Tcl core] [grammar_me]: ** Other Program Virtual Machines ** [Factor Programming Language%|%Factor]: [.NET]: [JVM]: [parrot]: [pypy]: ** System Virtual Machines ** [qemu]: ** Educational Virtual Machines ** [http://www-cs-faculty.stanford.edu/~uno/mmix.html%|%MMIX], by [Donald E. Knuth]: ** Single System Image ** [PVM%|%Parallel Virtual Machine]: <> concept