Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win


How to List processes by user and session ID

Posted on 2007-11-19
Medium Priority
Last Modified: 2008-02-01
Hi, I need VB6 code to get the list of processes on a PC that works with multiple users and sessions, that is a Windows XP with Terminal Server capabilities, ultra thin clients connect to that server. We found it possible through WMI, but it  consumes lots of  CPU, we need another API method that gives us user and session ID of every process on the machine
Question by:cyberproject
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2

Expert Comment

ID: 20320581
This has been a long standing issue for me too.  WMI is slow, and I did find a solution using API only.  I haven't tested this completely yet, so you may want to wait for a few minutes until I get this thing working properly.  The bad thing is that I'm not sure if this works on a Terminal Services environment...

Anyway, if you feel like digging a little deeper, take a look at this:


Looks like it may solve your problem completely, but I have not tested it (yet).  I'm curious enough to try to make this work, so I'll do it as soon as I have the time.

Hope this helps!

Expert Comment

ID: 20334647
OK, managed to get user names from processes... but only SYSTEM and processes runing on the same user name as the user launching the app (that would be me).  For all other processes, I would probably have to use an impersonation token, or something like that.  BUT, I found some working code for XP/2003 machines.  Maybe you can use it:


It should be easy to adapt to your needs.

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 20343835
Th last you sent Tacovino, is great. Works perfect if you logged on Windows as administrator. But my soft uses a "Run As" to relunch itself with an admin account, from a restricted user account that was originally logged on Windows. I mean, the user is in a restricted not Admin account, but my soft runs itself with a preconfigured admin account to get all the rights. The thing is that in every aspect I have admin priviledges, but the api WTSEnumProcesses used in the example returns fail in this case.
any ideas? , thanks

Expert Comment

ID: 20348224
As far as I know, there are some privileges regarding processes that not even the Admin group has.  I'm not sure how you implemented the "Run As" part, but if possible, try to make it run under SYSTEM account instead of and Admin account.  Remember that the SYSTEM account you need to use is the "server" system account (the server running terminal services).


Author Comment

ID: 20351457
I tested the project, logging with an admin account normally on the client, and still doesn´t work. That means the server doesn´t give me the right just because my session is remote. I´m logging ini from an ultra thin client hardware client. (www.ncomputing.com). I read that for this api to work I need "query information priviledges", don´t know how to get it.

Accepted Solution

Taconvino earned 1500 total points
ID: 20352305
Same thing for me.  As I posted before, this could involve impersonation, or security token modification... it's a complicated (yet fun) thing to do!  The time I played around with this thing was on a local computer only.  As far as I know, Terminal Services provide a complete set of APIs of its own, although I couldn't find anything that resembles SetTokenInformation in the WTS* set of APIs (look here: http://msdn2.microsoft.com/en-us/library/aa383464.aspx), but apparently it works just the same (http://msdn2.microsoft.com/en-us/library/aa379591.aspx).  The bottom line is, there is a lot of reading and "head banging" involved.

Here is a good example on how you can escalate privileges (it is implemented to kill processes):


Didn't work for me, but maybe you can tweak it a little bit more.


Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction In a recent article (http://www.experts-exchange.com/A_7811-A-Better-Concatenate-Function.html) for the Excel community, I showed an improved version of the Excel Concatenate() function.  While writing that article I realized that no o…
Article by: Martin
Here are a few simple, working, games that you can use as-is or as the basis for your own games. Tic-Tac-Toe This is one of the simplest of all games.   The game allows for a choice of who goes first and keeps track of the number of wins for…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
Suggested Courses

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question