We use an ASP page to re-direct our users to our PUBLIC view. This ASP page is in a IWA enabled virtual directory. The ASP page sets a variable with the users network login id. I would like to pass this variable in to the Dashboard so that I can pass it on to the Client. Is this possible?

Assuming that IWA places the network login id in the CGI variable (the standard variable is REMOTE_USER) the answer in general is: YES.
How to pass the variable depends on the purpose.
If you like to have the login id within your WF report, you can just add the following lines to the site.wfs (located in Drive:\ibi\client53\wfc\etc) configuration file:
<sendvar>
IISUSER=&REMOTE_USER
<endsendvar>
After restarting IIS (or just reloading the ibi_apps web application) you can get the user id within the report as the amper variable &IISUSER.
If you would like to pass the user id into the Dashboard web application, you can pass it as the request parameter, while constructing the redirect target (link, form, javascript etc.) on an ASP page.
There is also possibility to handle the CGI variable in the "very specific" way by changing the Worp_Views.jsp file. In this case the user id should be visible as the request.getRemoteUser() String variable.

Hope this helps (somehow)
Grzegorz