The tableBASE system is accessed through the application programming interface (API) called DK1TCALL. Since tableBASE Version 5, DK1TCALL can be used in CICS, Batch, IMS, and VTS operating environments. tableBASE programs that use this stub can be ported from one environment to another without requiring any stub relinking. Of course, programs must continue to conform to the requirements of each execution environment.
The current DK1TCALL stub is distinct from the stub of the same name used in Version 5. The DK1TCALL stubs previous to Version 6 were held in physically separate libraries—one for each operating environment. With Version 6, one universal DK1TCALL stub was introduced for all operating environments.