Doubt On Scanning Hidden AP

[Raghavendra]

Hi All,

   In some spec I came across the word "Scanning Hidden AP". 

 Can any tell me what is this hidden AP means?

 Also whether wpa supplicant is capable of doing that?
 If so how to achieve it in wpa supplicant..I mean is there any special configuration that I have to do for scanning hidden AP using wpa supplicant?

-Raghu.
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