The Northern trust is a software developer for Windows.
It is reported that the following Windows processes are part of AppVChecker:
If you want to remove AppVChecker from your computer, just go to Start > Control Panel > Add/Remove programs and select AppVChecker from the list of programs.
It is reported that the following Windows processes are part of NTRS.WIT.SysInfo:
If you want to remove NTRS.WIT.SysInfo from your computer, just go to Start > Control Panel > Add/Remove programs and select NTRS.WIT.SysInfo from the list of programs.