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+Signal Extension (package Signal) Version 1.4.0.1 available
+
+See all my Tcl extensions at http://www.du.edu/~mschwart/tcl-tk.html
+http://www.nyx.net/~mschwart/signal_ext.html
+
+This extension adds dynamically loadable signal handling to Tcl/Tk scripts.
+It provides a very limited subset of the functionality of tclX (just the
+signal part, and about 3/4 of the functions for signals), but as a result
+is quite small and quick to load.
+
+Version 1.4 removes dependencies on Tk.
+Tilman Kranz (tilde@tk-sls.de) patched this for wider portability on Linux
+
+A summary of the extension usage follows:
+
+Usages: 
+
+signal add signo proc [-async]
+
+    Adds a signal handler for signal signo through proc proc.
+
+    Signals can be provided by number, or the most common ones are provided by
+    name (e.g., SIGHUP).
+
+    The proc is any Tcl procedure, and it is evaluated when the signal comes in.
+    It will be provided no arguments.
+
+    Signal handlers have Posix semantics--they persist until reset.
+
+    If -async is used, the signal handler is created using Tcl_AsyncCreate(). 
+    Checks for the signal are very frequent (each evaluation) using this
+    technique, but one doesn't know quite where evaluation is or how to handle
+    errors in this situation. The code will evaluate the provided procedure in 
+    the current interpreter if available, and in the interpreter which added the
+    signal handler otherwise. At least until a better scheme is suggested.
+
+    The -async is especially useful to interrupt "runaway" procs, or to cause a
+    quick exit; the default mechanism simply waits for another MainLoop cycle.
+
+signal delete signo
+
+    Restores handling of signal signo to the default (SIG_DFL).
+
+signal print 
+
+    Prints the handling of all signals with handlers.
+
+    Formatted as  signal ----> procedure 
+    or as         signal !---> procedure 
+    if the signal is handled asynchronously
+
+signal print signo
+
+    Prints the procedure for handling signal signo.
+
+    Prints the word UNHANDLED if no signal handler is active for that signal.
+
+signal version
+
+    Returns the string representing the current version of the package