There is documentation from ISAM Forms SSO. Take a look at:
https://www.ibm.com/support/knowledgecenter/SSPREK_9.0.1/com.ibm.isam.doc/wrp_config/concept/con_forms_sso_conc.html
As well as an example:
https://www.ibm.com/support/knowledgecenter/SSPREK_9.0.1/com.ibm.isam.doc/wrp_config/reference/ref_forms_sso_eg.html
Since we're talking all Microsoft/AD/IIS, desktop SSO might be an option as well:
https://www.ibm.com/support/knowledgecenter/SSPREK_9.0.6/com.ibm.isam.doc/wrp_config/concept/con_win_desktop_sso.html
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