The Users tab in Task Manager will show you the logged in users. The "who" command is for Linux, not Windows. MSINFO32 provides system information, Local Users and Groups shows user accounts on the system - not ones in use.
Task Manager, previously known as Windows Task Manager, is a task manager, system monitor, and startup manager included with Microsoft Windows systems. It provides information about computer performance and running software, including name of running processes, CPU load, commit charge, I/O details, logged-in users, and Windows services. Task Manager can also be used to set process priorities, processor affinity, start and stop services, and forcibly terminate processes.
The program can be started …