Marty List brings us NetUsers.
The readme contains:
Network Users \[Version 1.21\] Displays a list of users logged on to a specified Windows system. The syntax of this command is: NetUsers \[\\computername \\...\] \[/history\] \[/local\] \[/verbose\] \\computername Allows you to query remote systems. Multiple computers can be specified, each separated by a space. /history|/h Displays the user accounts that have logged on in the past. If history is omitted, currently logged on users are displayed. /local|/l Includes local user accounts in the output, by default they are skipped. In a domain these are usually service accounts. /verbose|/v Reports non-fatal problems as errors (such as deleted accounts) An argument of /? or -? displays this syntax and returns 1. A successful completion will return 0. Copyright 2000-2002 Marty List ================================================================== Revision History: 1.21 09/05/2002 Updated for Windows XP to skip 'LocalService' and 'NetworkService' accounts. 1.20 11/11/2000 Added additional internal debugging options. 1.11 02/12/2000 Fixed a cosmetic bug in the screen output. 1.10 02/10/2000 Added last logon time to the history output (/h). 1.00 01/28/2000 Initial release.