The Lotus Domino Administration 6.5.1 Help documentation states: As an administrator, you can include IM in single sign-on with Lotus Notes and push this feature down to users through dynamic configuration. To enable IM with single sign-on for users, use the NOTES.INI variable, IM_ENABLE_SSO=1.
However, there’s no instructions on how to push this down using dynamic configuration. I’ve searched this forum and the help documentation and haven’t found any further information. Can someone tell me how this is done?
Thank you.
Subject: Enabling IM SSO with Dynamic Configuration
Hello,perhaps its a little bit to late for you 
But here is the answer I hope. You need to add a line to your notes.ini
ConfigFile= points to a text (.TXT) file that contains the parameters that the wizard needs.
for example:
ConfigFile=C:\Documents and Settings\All Users\Application Data\Lotus\Notes\Data\Shared\config.txt
I copied this config.txt during the multiuserinstallation (I used the Installshild tuner) on the HD from the user, and let the Installshield-tuner add the line above to the notes.ini in the Folder:
C:\Documents and Settings\All Users\Application Data\Lotus\Notes\Data\
this works for me and my unattended multiuser Installation.
regards
Bastian