diff --git a/sys/apis/opus.lua b/sys/apis/opus.lua
index 11d0baa..c5e359e 100644
--- a/sys/apis/opus.lua
+++ b/sys/apis/opus.lua
@@ -10,7 +10,7 @@ local function runDir(directory, desc, open)
   table.sort(files)
 
   for _,file in ipairs(files) do
-    print(desc .. file)
+    --print(desc .. file)
     os.sleep(0)
     local result, err = open(directory .. '/' .. file)
     if not result then
@@ -23,7 +23,8 @@ local function runDir(directory, desc, open)
 end
 
 function Opus.loadExtensions()
-  return runDir('sys/extensions', '[ ext ] ', shell.run)
+  --return runDir('sys/extensions', '[ ext ] ', shell.run)
+  return true
 end
 
 function Opus.loadServices()
diff --git a/sys/apps/multishell b/sys/apps/multishell
index 43f5d99..304fe65 100644
--- a/sys/apps/multishell
+++ b/sys/apps/multishell
@@ -463,9 +463,9 @@ end)
 local function startup()
   local hasError
 
-  if not Opus.loadExtensions() then
-    hasError = true
-  end
+  --if not Opus.loadExtensions() then
+  --  hasError = true
+  --end
 
   local overviewId = multishell.openTab({
     path = 'sys/apps/Overview.lua',
diff --git a/sys/apps/shell b/sys/apps/shell
index c4c0d8e..630d2f6 100644
--- a/sys/apps/shell
+++ b/sys/apps/shell
@@ -1,11 +1,13 @@
 local parentShell = shell
 
-shell = { }
-local sandboxEnv = { }
+local shell = { }
+
+local sandboxEnv = setmetatable({ }, { __index = _G })
 for k,v in pairs(getfenv(1)) do
   sandboxEnv[k] = v 
 end
-setmetatable(sandboxEnv, { __index = _G })
+sandboxEnv.shell = shell
+sandboxEnv.multishell = multishell or { }
 
 requireInjector(getfenv(1))
 
@@ -66,7 +68,7 @@ function shell.run(...)
       result, err = os.run(Util.shallowCopy(sandboxEnv), path, unpack(args))
     end
 
-    if multishell then
+    if multishell and multishell.getTitle then
       local title = 'shell'
       if #tProgramStack > 0 then
         title = fs.getName(tProgramStack[#tProgramStack])
diff --git a/sys/boot/multishell.boot b/sys/boot/multishell.boot
index 1e1746d..c97177a 100644
--- a/sys/boot/multishell.boot
+++ b/sys/boot/multishell.boot
@@ -1,33 +1,28 @@
 print('\nStarting Opus..')
 
-LUA_PATH = '/sys/apis:/usr/apis'
-
-local Util = dofile('sys/apis/util.lua')
-_G.debug = function(...) Util.print(...) end
-_G.requireInjector = dofile('sys/apis/injector.lua')
-
-os.run(Util.shallowCopy(getfenv(1)), 'sys/extensions/device.lua')
-
--- vfs
-local s, m = os.run(Util.shallowCopy(getfenv(1)), 'sys/extensions/vfs.lua')
-if not s then
-  error(m)
-end
-
--- process fstab
-local mounts = Util.readFile('usr/etc/fstab')
-if mounts then
-  for _,l in ipairs(Util.split(mounts)) do
-    if l:sub(1, 1) ~= '#' then
-      print('mounting ' .. l)
-      fs.mount(unpack(Util.matches(l)))
-    end
+local function run(file, ...)
+  local env = setmetatable({
+    LUA_PATH = '/sys/apis:/usr/apis'
+  }, { __index = _G })
+  for k,v in pairs(getfenv(1)) do
+    env[k] = v 
   end
+
+  local s, m = loadfile(file, env)
+  if s then
+    local args = { ... }
+    s, m = pcall(function()
+      return s(table.unpack(args))
+    end)
+  end
+
+  if not s then
+    error(m or ('Error running ' .. file))
+  end
+  return m
 end
 
-pcall(function()
-  fs.mount('usr', 'gitfs', 'kepler155c/opus-apps/master')
-end)
+_G.requireInjector = run('sys/apis/injector.lua')
 
 -- user environment
 if not fs.exists('usr/apps') then
@@ -36,9 +31,20 @@ end
 if not fs.exists('usr/autorun') then
   fs.makeDir('usr/autorun')
 end
+if not fs.exists('usr/etc/fstab') then
+  Util.writeFile('usr/etc/fstab', 'usr gitfs kepler155c/opus-apps/master')
+end
 
-local env = Util.shallowCopy(getfenv(1))
-env.multishell = { }
+local dir = 'sys/extensions'
+for _,file in ipairs(fs.list(dir)) do
+  run('sys/apps/shell', fs.combine(dir, file))
+end
 
-local _, m = os.run(env, 'sys/apps/shell', 'sys/apps/multishell')
-printError(m or 'Multishell aborted')
+fs.loadTab('usr/etc/fstab')
+
+local args = { ... }
+if #args == 0 then
+  args = { 'sys/apps/shell', 'sys/apps/multishell' }
+end
+
+run(table.unpack(args))
diff --git a/sys/extensions/vfs.lua b/sys/extensions/vfs.lua
index 84fe862..186a928 100644
--- a/sys/extensions/vfs.lua
+++ b/sys/extensions/vfs.lua
@@ -284,6 +284,23 @@ function fs.mount(path, fstype, ...)
   return node
 end
 
+function fs.loadTab(path)
+  local mounts = Util.readFile(path)
+  if mounts then
+    for _,l in ipairs(Util.split(mounts)) do
+      if l:sub(1, 1) ~= '#' then
+        local s, m = pcall(function()
+          fs.mount(table.unpack(Util.matches(l)))
+        end)
+        if not s then
+          printError('Mount failed')
+          printError(l)
+        end
+      end
+    end
+  end
+end
+
 local function getNodeByParts(parts)
   local node = fs.nodes