One of the useful Powered Keylogger's features is the possibility to specify the account name that should be monitored. This feature could be useful if you share one PC between several users and would like to monitor particular user/users only. To specify username, please, click "Options" Navigation Toolbar button, press "Advanced Options" and select "Monitoring users list" tab in "Advanced Options" dialog:

Enable/disable logging by marking/unmarking corresponding checkboxes in front of user names you want to monitor.