You want to have Single Sign-On to the SAP CRM Web UI without the need of a SAP NetWeaver Java Stack.
- SSO enabled for the SAP GUI for Windows according to SAP Note 352295 - Microsoft Windows Single Sign-On options
- Applied Note 1467488 - Start WebClient UI with user credentials of SAP GUI
After you've applied the Note 1447488 you should create a new variant for the report BSP_WD_APPL_STARTER with this settings:
Save it i.e. as ZSAP_CRMUI. Then create a copy of transaction CRM_UI or modify CRM_UI to point to the just saved Variant:
Try out the modified or created transaction. You should be taken to the CRM WebUI without the need to provide a password.
To directly access the WebUI without the need to start SAP Logon first you can create a SAP Shortcut File. Start i.e. SE80 and click on the SAP Shortcut Icon
and modify the settings according to this screen shot:
If you want to distribute this file to different users or provide it as a link in your intranet you have to edit the textfile and remove the line "Name=USERNAME" and save it.