From The x3270 Wiki

wx3270 supports tracing of user interface events. Tracing can be configured via the -uitrace command-line option or the actions window. Traces are helpful in debugging; you may be asked to supply a user interface event trace if you report a problem.

Trace types

Trace type Description
None No tracing
Key Keyboard events
Profile Profile operations
BackEnd Back-end (b3270) operations
Clipboard Clipboard (copy/paste) operations
Sound Sound operations
Draw Screen drawing operations
All All of the above