Remote debugging of programs still works as described in the TclPro User Manual
and the initdebug man page at lib/remotedebug/docs/initdebug.pdf.

The only addition is that for the sake of convenience the initdebug.tcl file has
been wrapped in a package, so that (assuming the auto_path variable has been
initialized properly) a client code file can be prepared for remote debugging
simply by adding the commands:

  package require remotedebug
  debugger_init
  debugger_eval {<code to be debugged>}