CLI consists of the following data structures:
- DBCAREA and its extensions – Data Structure
- CLI2SPB – CLIv2 System Parameter Block
- CLI2SCB – CLIv2 Session Control Block
- CLI2RCB – CLIv2 Request Control Block
- MTDPCB – MTDP Control Block
Besides DBCAREA, its extensions, and CLI2SPB (part of SFB is available through clispb.dat), none of the following control blocks are available outside of CLI.