Here we would like to draw your attention to CRM_UI transaction code in SAP. As we know it is being used in the SAP CA-WUI (WebClient UI in CA) component which is coming under CA module (Cross Application).CRM_UI is a transaction code used for Start CRM WebClient in SAP.
It comes under the package CRM_BSP_UI_FRAME_APPL.
Transaction CRM_UI technical data table
|Purpose||Start CRM WebClient|