I was wondering if anyone knew how to or if it is even possible to get a web application user session count?

I can get that session count at the Web Site level by doing

Get-Counter "\\$ServerName\web service($website)\current connections"

Might be worth posting over on the IIS forum:

http://forums.iis.net/1151.aspx/1?PowerShell

See this for an example of what is needed: http://www.xyzws.com/servletfaq/how-to-count-active-sessions-in-your-web-application/11

This might also work. It works on WS2008R2

$ServerName =$env:computername
$SiteName = 'default web site'
get-counter "\\$ServerName\web service($SiteName)\current connections"

This might also work. It works on WS2008R2

$ServerName =$env:computername
$SiteName = 'default web site'
get-counter "\\$ServerName\web service($SiteName)\current connections

Yeah I posted over there also, just in case. It doesn't seem like it is a possibility at the application level like you said and from what I have researched, but we will see, well at least using PowerShell.

Only way I can see it done, is through the web application itself, to create a static variable in the Global.ascx file, and increase it during the session_start event or decrease it during the session_end event, but since I don't own these applications, that is not possible :-)

Did you check to see if perf counters have been added to the app pool.  I don't remmeebr them at IIS7 but haven't look at 2008R2 iIIS 7.5 or later,

Start with this:

Get-Counter  -ListSet ASP*|select countersetname

Get-Counter  -ListSet ASP* | select -expand counter|?{$_ -match 'session'}

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