stay_open
    Specifies a value used to indicate when to close the hosts
    database file (TCPIP$ETC:IPNODES.DAT):
    o  A value of 0 closes the hosts database file after each call
       to the gethostbyname(), gethostbyaddr(),  or gethostent()
       function.
    o  A nonzero value keeps the hosts database file open after each
       call.