The Splash / Startup Window shows various
technical information about the system and program startup. In the bottom right corner is an
entry-box for text searches; just type your text and press return.
Just above the bottom is another, larger, entry-box. This is Scid vs PC's Console which enables input of Tcl/Tk commands for debugging and advanced use.
For more information about Tcl, try
Tutorials Point's Tcl and
Tk tutorials.