ATKDebugger is a C extension to provide specific debugging commands to Tcl. It is a low API to enable one to write debugging tools in Tcl. It requires a patch to Tcl8.4.1
Downloads and more information including the description of internal implementation and API can be found at:
http://www.xdobry.de/atkdebugger/index.html
These functions are now possible:
The package also contains an example GUI debugger written in Tk.
atkdebugger is full integrated into XOTclIDE
Author: Artur Trzewik
See also What debugging tools are available to a Tcl programmer