Number of Windows Open

[Ronan]

Hi there,
Can anyone tell me is there a limit on the numbers of
windows you can have open with Windows 2k Pro? Is there
an actual limit built into the OS or does it just depend
on the machine's memory?

 

[Ken Simmons [MSFT]]

Hello,

There is not a limit. It depends on system resources.

Regards,

Ken Simmons

Microsoft Technical Support for Platforms and Business Applications

 

[Torgeir Bakken (MVP)]

Can anyone tell me is there a limit on the numbers of
windows you can have open with Windows 2k Pro? Is there
an actual limit built into the OS or does it just depend
on the machine's memory?

Hi

With default allocation values in the interactive desktop heap, you e.g. cannot
open more than 50 to 75 Explorer/Internet Explorer windows.

It is the registry value "Windows" under this key that defines the allocation
size:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
\Session Manager\SubSystems\


The second number in this substring is the value that defines this size:

....SharedSection=1024,3072,512 ...


And from a previous post:

From: Willy Denoyette [MVP]
Subject: Re: System resource usage
Newsgroups: microsoft.public.dotnet.framework.performance
Date: 2003-12-01 14:59:51 PST

</quote>
User objects are allocated from the desktop heap which has a system wide
size of 48MB on W2K, this heap consists of three sharedsections, the first
is common to all desktops, the second is per interactive desktop, and the
third is reserved for non interactive desktops.

The values for the three distinct heaps is taken from the registry when the
CSRSS process starts
(see:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session
Manager\SubSystems\Windows), what you could do is paly a little bit with the
values found in there taking care that the sum of all heaps must fit into 48
MB!!!
</quote>

Before you think about editing that value, please read the two following
Knowledge Base articles carefully:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;184802

http://support.microsoft.com/default.aspx?scid=kb;en-us;126962

 

[shatapos]

Hello,


I was wondering if 48mb is the heap sum limit in Windows 2003 Server
(Enterprise/Datacenter) as well.


If so is it changable?


I'm hoping for your asistance as this problem is causing me premature
hairloss.


Thanks!


Eyal Weinreb
Israel