o, g, l, n are letters that make 'log on'
log, on are words within 'log on'
1 possible definitions for 'log on'
Under this definition, log on is a verb and has the following properties:
log in, log-in have the same meaning as 'log on'
log out, log off have the opposite meaning of 'log on'
'log on' can be a type of access.