navicli is the classic navi commands that anyone with access to the machine with navicli installed can run.  naviseccli is the secure navicli.  Commands can be run in two ways.  in the command entered you enter the user name password and access level or  create a naviseccli security file with an authorized user information in it and you then do not need to enter all the user infomation in every command.   NAVISECCLI:
We installed navicli on an AIX server but end up with naviseccli not navicli?  Is there a difference? 
What is the difference betwen navicli and naviseccli