I'm currently on holiday and I need to look in the sources to answer. I will be back at the end of august.

But can you tell me which Windows and VDT version you're using?

Sorry for not answering before!

I'm using VDT version 2.51.2 and Windows XP with SP2.

I'm just trying to create one non-virtual window. I did it before and went, but I was still in testing phase and erased it afterwards :)

P.S: I just tryed to reproduce the error and it worked Don't think that I posted the problem right after the first occurrence. I tryed many times and rebooted also some times trying to make it work. I haven't tryed again since I posted the problem and waiting for an answer. I don't know what can have happened

NOOOO!!! It's failing again! There is for sure between yesterday when it worked and today, but which one, I can't figure it out

Let's say that it would be a good idea to leave the thread open, isn't it?

Please download the latest version (VDT 2.52) and try again to create a non virtual desktop. When it fails, go to the Windows event viewer (Administrative Tools), Application LOG. You should have an error message with "R2d2 Kernel Authority" as source. Can you give me this message description?

 

This error code is the return code of the CreateDesktop Windows API. You can find information by searching CreateDesktop and ERROR_NOT_ENOUGH_MEMORY over the Internet.

The Microsoft page is http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/createdesktop.asp

This message appears when there is not enough system heap memory to create desktops; I cannot do anything as this is a Windows return code (I made a few tests on some workstation; non virtual desktops maximum number was between 8 and 12. I don't know why you have this error when creating the first one). Here is the Microsoft explanation:

The number of desktops that can be created is limited by the size of the system desktop heap, which is 48 MB. Desktop objects use the heap to store resources. You can increase the number of desktops that can be created by reducing the default heap reserved for each desktop in the interactive window station. This value is specified in the SharedSection substring of the following registry value: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems\Windows. The default data for this registry value is as follows:

%SystemRoot%\system32\csrss.exe ObjectDirectory=\Windows
SharedSection=1024,3072,512 Windows=On SubSystemType=Windows
ServerDll=basesrv,1 ServerDll=winsrv:UserServerDllInitialization,3
ServerDll=winsrv:ConServerDllInitialization,2 ProfileControl=Off
MaxRequestThreads=16

The first SharedSection value is the size of the shared heap common to all desktops, in kilobytes.
The second SharedSection value is the size of the desktop heap needed for each desktop that is created in the interactive window station, WinSta0, in kilobytes.
The third SharedSection value is the size of the desktop heap needed for each desktop that is created in a noninteractive window station, in kilobytes.

You can create virtual desktop without any error as virtual desktops are a VDT software implementation.