> For the complete documentation index, see [llms.txt](https://docs.editran.onesait.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.editran.onesait.com/documentacion-editran/ibm-editran-v5.3-cics-en/installation/definition-of-transactions-in-cics.md).

# Definition of transactions in CICS

* The transaction names must be specified in the profile of the editran Local Environment and can therefore be chosen freely in each installation.
* The transid ZTBT, and the listeners (ZTBA, etc.), must run permanently.
* The transid ZTB0, ZTBA and ZTBB (the latter 2 for TCP/IP interface, in which case consult the [TCP Manual](/documentacion-editran/ibm-editran-v5.3-cics-en/tcp.md)) must have the highest priority to speed up communications.
* The transid ZTBG is for EXCI buffers.
* To view the transactions, check the PCTCEDA\* member(s).
* The Tclass parameter points to the transid class and if included it must be related to the SIT MXT parameter.


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