Can someone please explain easyrsa vars options for PKI generation

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http://serverfault.com – I am using OpenVPN and whilst I can generate certificates using easyrsa just fine I don't really understand the settings in the easyrsa vars file: export KEY_COUNTRY="" export KEY_PROVINCE="" export KEY_CITY="" export KEY_ORG export KEY_EMAIL="" export KEY_EMAIL= export KEY_CN= export KEY_NAME= export KEY_OU= export PKCS11_MODULE_PATH= export PKCS11_PIN=1234 Can anyone explain these settings ? Thanks in advance. (HowTos)