single or dual processor

Hi all

I've found cpu informationproc-cpuinfo on my Linux, as below. It seems that I have two processors, which is obviously not true. Can anyone tell me why it looks like that and how can I identify real dual processor machine? Thank you very much. Please dont tell me remove lid and see, :).

Chenxi

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processor : 0 vendorid : GenuineIntel cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 4 cpu MHz : 2992.612 cache size : 1024 KB physical id : 0 siblings : 2 runqueue : 0 fdivbug : no hltbug : no f00fbug : no comabug : no fpu : yes fpuexception : yes cpuid level : 5 wp : yes 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 bogomips : 5976.88

processor : 1 vendorid : GenuineIntel cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 4 cpu MHz : 2992.612 cache size : 1024 KB physical id : 0 siblings : 2 runqueue : 0 fdivbug : no hltbug : no f00fbug : no comabug : no fpu : yes fpuexception : yes cpuid level : 5 wp : yes 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 bogomips : 5976.88