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 ** [.NET] : [JVM] : [parrot] : ** System Virtual Machines ** [qemu] : ** Single System Image ** [PVM%|%Parallel Virtual Machie] : <> concept