The Expression Tester works on all files in the project, either for the whole expression in expression files with the extension ducx-xp or inside of any expression element.
To use short references, imports can be used, just like in all other domain specific files.
The expression can be fired against the current web service by selecting “Run as... Expression” from the context menu. The shortcut for this is “Alt - X”.
As long as the expression is running, the Expression Tracer View is activated and displays the trace lines.
The result of the expression is sent to the Expression Tester Result Window, which displays the value as a tree.