device: 0.817
user-level: 0.774
performance: 0.658
mistranslation: 0.640
semantic: 0.500
network: 0.393
virtual: 0.352
architecture: 0.315
arm: 0.277
graphic: 0.262
boot: 0.210
PID: 0.202
i386: 0.195
register: 0.186
risc-v: 0.135
ppc: 0.131
files: 0.129
debug: 0.097
TCG: 0.075
hypervisor: 0.070
vnc: 0.057
permissions: 0.048
peripherals: 0.036
x86: 0.034
assembly: 0.028
VMM: 0.024
socket: 0.021
kernel: 0.008
KVM: 0.003

User-emu documentation mentions inexistent "runtime" downloads