[android-developers] NFC/RFID

Is it possible to create an application utilizing NFC(Near field
Communication) of mobile phone which will communicate with existing
RFID infrastructure ?Have both in the same frequency range? I read in
an article that says RFID has a High Frequency (HF) band at 13.56 MHz
and that have longer communication range. I confused that NFC has the
same frequency limit but short communication range;how it possible?
Does NFC support all RFID technologies ( both active and passive RFID)?

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