CSRSS.EXE (Client Server Runtime Process) is part of the user’s Win32 subsystem. Сsrss.exe is responsible for console applications, creating / deleting threads and for the 16-bit MS-DOS virtual environment.
When studying the running processes in the Windows 10, 8 and Windows 7 task manager, you may have a question: what is the csrss.exe (Client Server Runtime Process), especially if it loads the processor, which sometimes happens.