diff --git a/my_docs/21/lmod_zoom_mtg_2021_09_07/Makefile b/my_docs/21/lmod_zoom_mtg_2021_09_07/Makefile
index ffdf6b6c8..1b3d94a9d 100644
--- a/my_docs/21/lmod_zoom_mtg_2021_09_07/Makefile
+++ b/my_docs/21/lmod_zoom_mtg_2021_09_07/Makefile
@@ -1,4 +1,4 @@
-TALKS    := talk.pdf
+TALKS    := presentation.pdf
 TEX_SUFS := .aux .log .nav .out .snm .toc .vrb .fdb_latexmk .fls
 
 %.pdf:%.tex
diff --git a/my_docs/21/lmod_zoom_mtg_2021_09_07/presentation.pdf b/my_docs/21/lmod_zoom_mtg_2021_09_07/presentation.pdf
new file mode 100644
index 000000000..55b0254dc
Binary files /dev/null and b/my_docs/21/lmod_zoom_mtg_2021_09_07/presentation.pdf differ
diff --git a/my_docs/21/lmod_zoom_mtg_2021_09_07/talk.tex b/my_docs/21/lmod_zoom_mtg_2021_09_07/presentation.tex
similarity index 83%
rename from my_docs/21/lmod_zoom_mtg_2021_09_07/talk.tex
rename to my_docs/21/lmod_zoom_mtg_2021_09_07/presentation.tex
index 94f3076a4..c25c73028 100644
--- a/my_docs/21/lmod_zoom_mtg_2021_09_07/talk.tex
+++ b/my_docs/21/lmod_zoom_mtg_2021_09_07/presentation.tex
@@ -119,7 +119,7 @@ \section{Introduction}
   \frametitle{Compute Canada}
   \begin{itemize}
     \item https://github.com/ComputeCanada/software-stack-config/blob/main/lmod/SitePackage.lua\#L261-L272
-    {\small
+    {\tiny
 \begin{semiverbatim}
      local function load\_hook(t)
         local valid = validate\_license(t)
@@ -131,6 +131,11 @@ \section{Introduction}
      end
 \end{semiverbatim}
     }
+    \item Setting families: https://github.com/ComputeCanada/software-stack-config/blob/main/lmod/SitePackage\_families.lua
+    \item Logging code:
+      https://github.com/ComputeCanada/software-stack-config/blob/main/lmod/SitePackage\_logging.lua
+    \item  Module properties https://github.com/ComputeCanada/software-stack-config/blob/main/lmod/SitePackage\_properties.lua
+    \item https://github.com/ComputeCanada/software-stack-config/blob/main/lmod/SitePackage\_visible.lua
     \end{itemize}
 \end{frame}
 
@@ -147,16 +152,28 @@ \section{Introduction}
 \begin{frame}{Basic hooks}
   \begin{itemize}
     \item load hook - Called on every load
-    \item avail - Map directories into labels: https://lmod.readthedocs.io/en/latest/200\_avail\_custom.html
+    \item avail - Map directories into labels
     \item startup - called at startup
     \item finalize - called just before Lmod is about to finish
     \item isVisibleHook - Reports whether a module should be visible
-      or not to avail and spider.
-    \item SiteName - Hook to specify Site Name (\emph{site}\_FAMILY\_\emph{something}) for family prefix
+      to avail and spider.
+    \item SiteName - Hook to specify Site Name
+      (\emph{site}\_FAMILY\_\emph{something}) for family prefix for
+      hierarchical module layout: TACC\_FAMILY\_COMPILER
   \end{itemize}
 \end{frame}
 
 % page 13
+\begin{frame}{isVisibleHook}
+  \begin{itemize}
+    \item isVisibleHook(modT): Reports whether a module should be visible
+      to avail and spider.
+    \item modT=\{fullName=..., sn=..., fn=...\}
+    \item Where fullName is name/version, sn = name and fn is fileName
+  \end{itemize}
+\end{frame}
+
+% page 14
 \begin{frame}{Shared Home Filesystem hook}
   \begin{itemize}
     \item groupName - This hook adds the arch and os name to
@@ -164,7 +181,7 @@ \section{Introduction}
   \end{itemize}
 \end{frame}
 
-% page 14
+% page 15
 \begin{frame}{Advanced Hooks}
   \begin{itemize}
     \item unload - Called on every unload
@@ -179,7 +196,7 @@ \section{Introduction}
   \end{itemize}
 \end{frame}
 
-% page 15
+% page 16
 \begin{frame}{HookArray}
   \begin{itemize}
     \item A module can load other modules
@@ -190,7 +207,7 @@ \section{Introduction}
   \end{itemize}
 \end{frame}
 
-% page 16
+% page 17
 \begin{frame}[fragile]
   \frametitle{Contrib/TACC/SitePackage.lua: }
     {\tiny
@@ -224,12 +241,13 @@ \section{Introduction}
 \end{frame}
 
 
-% page 17
+% page 18
 \begin{frame}{Other hooks in the documentation}
   \begin{itemize}
-    \item Avail: https://lmod.readthedocs.io/en/latest/200_avail_custom.html
-    \item msgHook: https://lmod.readthedocs.io/en/latest/170_hooks.html
+    \item Avail: https://lmod.readthedocs.io/en/latest/200\_avail\_custom.html
+    \item msgHook: https://lmod.readthedocs.io/en/latest/170\_hooks.html
   \end{itemize}
 \end{frame}
 
+
 \end{document}
diff --git a/src/MName.lua b/src/MName.lua
index b1fab787d..17193df8b 100644
--- a/src/MName.lua
+++ b/src/MName.lua
@@ -454,7 +454,7 @@ local function find_highest_by_key(self, key, fileA)
    for j = 1,#a do
       local entry = a[j]
       local v     = entry[key]
-      if (mrc:isVisible({fullName=entry.fullName,sn=entry.sn,fn=entry.fn}) or isMarked(v)) then
+      if (mrc:isVisible{fullName=entry.fullName,sn=entry.sn,fn=entry.fn} or isMarked(v)) then
          if (v > weight) then
             idx    = j
             weight = v
diff --git a/src/ModuleA.lua b/src/ModuleA.lua
index 21afe4bf1..89d7072cf 100644
--- a/src/ModuleA.lua
+++ b/src/ModuleA.lua
@@ -312,11 +312,11 @@ function M.__find_all_defaults(self)
       end
 
       if (keepLooking) then
-         if (v.file and (show_hidden or mrc:isVisible({fullName=sn, sn=sn, fn=v.file}))) then
+         if (v.file and (show_hidden or mrc:isVisible{fullName=sn, sn=sn, fn=v.file})) then
             defaultT[sn] = {weight = "999999999.*zfinal", fullName = sn, fn = v.file, count = 1}
          elseif (next(v.fileT) ~= nil) then
             for fullName, vv in pairs(v.fileT) do
-               local vis = mrc:isVisible({fullName=fullName, sn=sn, fn=vv.fn}) or isMarked(vv.wV)
+               local vis = mrc:isVisible{fullName=fullName, sn=sn, fn=vv.fn} or isMarked(vv.wV)
                if (show_hidden or vis) then
                   count = count + 1
                   if (vis and (vv.wV > weight)) then
@@ -371,14 +371,14 @@ function M.build_availA(self)
    local function l_build_availA_helper(mpath, sn, v, A)
       local icnt = #A
       if (v.file ) then
-         if (show_hidden or mrc:isVisible({fullName=sn,sn=sn,fn=v.file})) then
+         if (show_hidden or mrc:isVisible{fullName=sn,sn=sn,fn=v.file}) then
             local metaModuleT = v.metaModuleT or {}
             A[icnt+1] = { fullName = sn, pV = sn, fn = v.file, sn = sn, propT = metaModuleT.propT}
          end
       end
       if (next(v.fileT) ~= nil) then
          for fullName, vv in pairs(v.fileT) do
-            if (show_hidden or mrc:isVisible({fullName=fullName,sn=sn,fn=vv.fn})) then
+            if (show_hidden or mrc:isVisible{fullName=fullName,sn=sn,fn=vv.fn}) then
                icnt    = icnt + 1
                A[icnt] = { fullName = fullName, pV = pathJoin(sn,vv.pV), fn = vv.fn, sn = sn, propT = vv.propT}
             end
diff --git a/src/Spider.lua b/src/Spider.lua
index 1fe542cfc..973f8c77e 100644
--- a/src/Spider.lua
+++ b/src/Spider.lua
@@ -555,7 +555,7 @@ function M.buildDbT(self, mpathA, mpathMapT, spiderT, dbT)
          end
          t.parentAA     = parentT[mpath]
          t.fullName     = sn
-         t.hidden       = not mrc:isVisible({fullName=sn, sn=sn, fn=v.file})
+         t.hidden       = not mrc:isVisible{fullName=sn, sn=sn, fn=v.file}
          T[v.file]      = t
       end
       if (next(v.fileT) ~= nil) then
@@ -571,7 +571,7 @@ function M.buildDbT(self, mpathA, mpathMapT, spiderT, dbT)
             end
             t.parentAA   = parentT[mpath]
             t.fullName   = fullName
-            t.hidden     = not mrc:isVisible({fullName=fullName, sn=sn, fn=vv.fn})
+            t.hidden     = not mrc:isVisible{fullName=fullName, sn=sn, fn=vv.fn}
             if (not vv.dot_version) then
                T[vv.fn]  = t
             end
@@ -618,7 +618,7 @@ function M.buildProvideByT(self, dbT, providedByT)
    local mrc = MRC:singleton()
    for sn, vv in pairs(dbT) do
       for fullPath, v in pairs(vv) do
-         local hidden = not mrc:isVisible({fullName=v.fullName, sn=sn, fn=fullPath})
+         local hidden = not mrc:isVisible{fullName=v.fullName, sn=sn, fn=fullPath}
          if (v.provides ~= nil) then
             local providesA = v.provides
             for i = 1, #providesA do
@@ -873,7 +873,7 @@ function M.spiderSearch(self, dbT, providedByT, userSearchPat, helpFlg)
          if (T) then
             dbg.print{"Have T\n"}
             for fn, v in pairs(T) do
-               if (mrc:isVisible({fullName=v.fullName,fn=fn,sn=origUserSearchPat})) then
+               if (mrc:isVisible{fullName=v.fullName,fn=fn,sn=origUserSearchPat}) then
                   found = true
                   break
                end
@@ -907,7 +907,7 @@ function M.spiderSearch(self, dbT, providedByT, userSearchPat, helpFlg)
       local fullA = {}
       for sn, vv in pairs(dbT) do
          for fn, v in pairs(vv) do
-            if (show_hidden or mrc:isVisible({fullName=v.fullName,sn=sn,fn=fn})) then
+            if (show_hidden or mrc:isVisible{fullName=v.fullName,sn=sn,fn=fn}) then
                 fullA[#fullA+1] = {sn=sn, fullName=v.fullName}
             end
          end
@@ -1017,7 +1017,7 @@ function M._Level1(self, dbT, providedByT, possibleA, sn, key, helpFlg)
          dbg.print{"Have T in countEntries\n"}
          dbg.print{"key: ",key,"\n"}
          for fn, v in pairs(T) do
-            if (show_hidden or mrc:isVisible({fullName=v.fullName,sn=sn,fn=fn})) then
+            if (show_hidden or mrc:isVisible{fullName=v.fullName,sn=sn,fn=fn}) then
                if (v.fullName == key) then
                   aa[#aa + 1] = v
                end
diff --git a/src/check_module_tree_syntax.in.lua b/src/check_module_tree_syntax.in.lua
index 2cfbb7468..027e91230 100644
--- a/src/check_module_tree_syntax.in.lua
+++ b/src/check_module_tree_syntax.in.lua
@@ -139,7 +139,7 @@ function walk_spiderT(spiderT, mt, mList, errorT)
 
       if (next(v.fileT) ~= nil) then
          for fullName, vv in pairs(v.fileT) do
-            if (show_hidden or mrc:isVisible({fullName=fullName,sn=sn,fn=vv.fn})) then
+            if (show_hidden or mrc:isVisible{fullName=fullName,sn=sn,fn=vv.fn}) then
                check_syntax(mpath, mt, mList, sn, vv.fn, fullName, errorT.syntaxA)
             end
          end
diff --git a/src/utils.lua b/src/utils.lua
index b501ddf10..439c4b78a 100644
--- a/src/utils.lua
+++ b/src/utils.lua
@@ -475,7 +475,7 @@ end
 
 function isActiveMFile(mrc, full, sn, fn)
    local version = extractVersion(full, sn) or ""
-   return mrc:isVisible({fullName=full, sn=sn, fn=fn}), version
+   return mrc:isVisible{fullName=full, sn=sn, fn=fn}, version
 end
 
 -----------------------------------------------------------------------