NWAdmin is a command line tool that ships with Nintex Workflow 2010. It is used to perform various administration operations.
By default, the NWAdmin.exe tool is installed to the SharePoint hive, typically at the following path.
%ProgramFiles%\Common Files\Microsoft Shared\Web Server Extensions\14\BIN
Note: For some versions of Nintex Workflow 2010, the NWAdmin tool is installed in the installation directory, typically at the following path:
%ProgramFiles%\Nintex\Nintex Workflow 2010.