The UCA contains information that HCD uses to communicate with the UIM, such as:

• The request the UIM is called with
• Error information provided by the UIM
• The entry points of the UIM service routines
• The address of the internal text record (IODV)
• The return code set by the UIM

The UCA points to:

• The CIT build routine
• The DCT build routine
• The DFT build routine
• The generic update routine
• The GIT build routine
• The SIT build routine
• The UIT build routine