Hello,
on windows, you can run the agent with /local or specify it in the ini file : http://wiki.ocsinventory-ng.org/index.php/Documentation:WindowsAgent#OCS_Inventory_NG_Agent_for_Windows_command_line_options.
For Unix, documentation is here : http://wiki.ocsinventory-ng.org/index.php/Documentation:UnixAgent#Agent.E2.80.99s_command_line_switches
Bexounet.