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diff --git a/src/interp/bc-util.boot b/src/interp/bc-util.boot
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+-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+-- All rights reserved.
+-- Copyright (C) 2007, Gabriel Dos Reis.
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions are
+-- met:
+--
+--     - Redistributions of source code must retain the above copyright
+--       notice, this list of conditions and the following disclaimer.
+--
+--     - Redistributions in binary form must reproduce the above copyright
+--       notice, this list of conditions and the following disclaimer in
+--       the documentation and/or other materials provided with the
+--       distribution.
+--
+--     - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+--       names of its contributors may be used to endorse or promote products
+--       derived from this software without specific prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+import '"ht-util"
+)package "BOOT"
+
+bcFinish(name,arg,:args) == bcGen bcMkFunction(name,arg,args)
+
+bcMkFunction(name,arg,args) ==
+  args := [x for x in args | x]
+  STRCONC(name,'"(",arg,"STRCONC"/[STRCONC('",", x) for x in args],'")")
+
+bcString2HyString2 s ==
+  (STRINGP s) and (s.0 = char '_")  =>
+    len := #s
+    STRCONC('"\_"", SUBSTRING(s, 1, len-2), '"\_"")
+  s
+
+bcString2HyString s == s
+
+bcFindString(s,i,n,char) ==  or/[j for j in i..n | s.j = char]
+
+bcGen command ==
+  htInitPage('"Basic Command",nil)
+  string :=
+    #command < 50 => STRCONC('"{\centerline{\tt ",command,'" }}")
+    STRCONC('"{\tt ",command,'" }")
+  htMakePage [
+     '(text
+        "{Here is the AXIOM command you could have issued to compute this result:}"
+            "\vspace{2}\newline "),
+      ['text,:string]]
+  htMakeDoitButton('"Do It", command)
+  htShowPage()
+
+-- bcGen for axiom - nag link
+linkGen command ==
+  htInitPage('"AXIOM-Nag Link Command",nil)
+  string := 
+    #command < 50 => STRCONC('"{\centerline{ ",command,'" }}")
+    command
+  htMakePage [
+     '(text 
+        "\centerline{{\em Here is the AXIOM command}}"
+          "\centerline{{\em you could have issued to compute this result:}}"
+            "\vspace{2}\newline "),
+      ['text,:string]]
+  htMakeDoitButton('"Do It", command)
+  htShowPage()
+
+bcOptional s ==
+  s = '"" => '"2"
+  s
+
+bcvspace() == bcHt '"\vspace{1}\newline "
+
+bcString2WordList s == fn(s,0,MAXINDEX s) where
+  fn(s,i,n) ==
+    i > n => nil
+    k := or/[j for j in i..n | s.j ^= char '_  ]
+    null INTEGERP k => nil
+    l := bcFindString(s,k + 1,n,char '_  )
+    null INTEGERP l => [SUBSTRING(s,k,nil)]
+    [SUBSTRING(s,k,l-k),:fn(s,l + 1,n)]
+
+
+bcwords2liststring u ==
+  null u => nil
+  STRCONC('"[",first u,fn rest u) where
+    fn(u) ==
+      null u => '"]"
+      STRCONC('", ",first u,fn rest u)
+
+bcVectorGen vec == bcwords2liststring vec
+
+bcError string ==
+  sayBrightlyNT '"NOTE: "
+  sayBrightly string
+
+bcDrawIt(ind,a,b) == STRCONC(ind,'"=",a,'"..",b)
+
+bcNotReady htPage ==
+  htInitPage('"Basic Command",nil)
+  htMakePage '(
+     (text .
+        "{\centerline{\em This facility will soon be available}}"))
+  htShowPage()
+
+htStringPad(n,w) ==
+  s := STRINGIMAGE n
+  ws := #s
+  STRCONC('"\space{",STRINGIMAGE (w - ws + 1),'"}",s)
+
+stringList2String x ==
+  null x => '"()"
+  STRCONC('"(",first x,"STRCONC"/[STRCONC('",",y) for y in rest x],'")")
+
+htMkName(s,n) == STRCONC(s,STRINGIMAGE n)
+