getutmp (3)          - copy utmp structure to utmpx, and vice versa
getutmpx (3)         - copy utmp structure to utmpx, and vice versa
mpx (2)              - unimplemented system calls
Net::DNS::RR::PX (3pm) - DNS PX resource record
updwtmpx (3)         - append an entry to the wtmp file
utmpx (5)            - login records
utmpxname (3)        - access utmp file entries