Capital A Acid is a rudimentary acme interface to the debugger acid.
It uses a win to provide an interactive window for acid. In that window,
a couple of extra acme-specific features are enabled:
w(command)
runs the command and places its output in a new window.
e.g. w(lstk()) places the stack trace in a distinct window.
Also, in any such window, text executed with button 2 is
presented as input to acid in the main Acid window. Thus, for
example, one may evaluate variables presented in a stack trace
by `executing' it with button 2.