Simple question about wpa_supplicant conf file.

Soft Ergate ergatesoft at
Mon May 29 08:14:24 EDT 2006

What is the meaning of "ctrl_interface=/var/run/wpa_supplicant"?
Does that indicate the path of control program(wpa_cli)? if so, how does 
wpa_supplicant use the path?
In fact, the program "wpa_cli" is always in the same directory with 

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