This method allows to get the current call stack - all caller method names and line numbers. For example, calling xSession::xppCallStack() from the line 13 at the Tutorial_RunbaseBatch.dialog() method will give the following call stack:

Actually I even found one nice practical application for it - SysTestAssert class can be modified so that it will display the line number where assertion has failed. It becomes much easier to debug unit tests with such modification.
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