[Frank Pilhofer]'s Reload, Refresh, 
...,
[David Welton]'s endless reloads, 
[Jeffrey Hobbs]' use of "fresh" [tkcon] tabs
[http://groups-beta.google.com/group/comp.lang.tcl/browse_thread/thread/f23709cc07401cc5/ba2bfab93b3b73d8],
as well as 
[Keith Vetter]'s 
console resets
[http://mini.net/tcl/RestartingATkconApplication]
...

[A minimal debugger] ...

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[RS] routinely puts into [Tk]-provided scripts under development these two lines:
 bind . <Escape> {exec wish $argv0 &; exit}
 bind . <F1> {console show} ;# Windows only
With an interactive console, the following shortcut is often helpful:
 interp alias {} ? {} set errorInfo

Another little helper to display canvas x/y coordinates in the title bar:
 bind .c <Motion> {wm title . %x/%y}

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[Category Debugging]