/proc/cpuinfo flags for HyperThreading and 64bit capability

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Hi,

 Here is a newbie's newbie question. Please help.

 Does anyone know which flags mean "Hypertheading" and
"64bit capability"??
I can not find documents how to understand the flags
in output of "cat /proc/cpuinfo".

[root@testnode01 ~]# cat /proc/cpuinfo | grep flags
flags           : fpu vme de pse tsc msr pae mce cx8
apic sep mtrr pge mca cmov pat pse36 clflush dts acpi
mmx fxsr sse sse2 ss ht tm pbe lm pni monitor ds_cpl
cid xtpr

In the above output, does "ht" means hyperthreading?
and "lm" means "64bit capability"? If not, any one
know where I can find related documents?

Thanks a lot.




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