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Trace Files and Log Files 
When you use ICF for communications, security-relevant data can be recorded in trace files. You must handle access to these trace files as restrictively as possible.
In transaction SICF (Edit ® Traces), you can activate, deactivate, and display traces for individual services.
The following trace files can contain security-relevant data:
Work Process Traces
· dev_w<n>
ICM Trace
· dev_icm<n>
Message Server Trace
· dev_ms
Web Dispatcher Trace
· dev_wdisp
The administrator also has the option of granting or refusing access to ICF traces:
· Locking/Unlocking Access to ICF Trace Functions
For an overview of the SAP WebAS trace files, see the following:
