diff --git a/sys/apis/opus.lua b/sys/apis/opus.lua
new file mode 100644
index 0000000..11d0baa
--- /dev/null
+++ b/sys/apis/opus.lua
@@ -0,0 +1,38 @@
+local Opus = { }
+
+local function runDir(directory, desc, open)
+  if not fs.exists(directory) then
+    return true
+  end
+
+  local success = true
+  local files = fs.list(directory)
+  table.sort(files)
+
+  for _,file in ipairs(files) do
+    print(desc .. file)
+    os.sleep(0)
+    local result, err = open(directory .. '/' .. file)
+    if not result then
+      printError(err)
+      success = false
+    end
+  end
+
+  return success
+end
+
+function Opus.loadExtensions()
+  return runDir('sys/extensions', '[ ext ] ', shell.run)
+end
+
+function Opus.loadServices()
+  return runDir('sys/services', '[ svc ] ', shell.openHiddenTab)
+end
+
+function Opus.autorun()
+  local s = runDir('sys/autorun', '[ aut ] ', shell.run)
+  return runDir('usr/autorun', '[ aut ] ', shell.run) and s
+end
+
+return Opus
diff --git a/sys/apps/Lua.lua b/sys/apps/Lua.lua
index 3f189e2..5078afe 100644
--- a/sys/apps/Lua.lua
+++ b/sys/apps/Lua.lua
@@ -1,4 +1,4 @@
-local injector = requireInjector or load(http.get('http://pastebin.com/raw/c0TWsScv').readAll())()
+local injector = requireInjector or load(http.get('https://raw.githubusercontent.com/kepler155c/opus/master/sys/apis/injector.lua').readAll())()
 injector(getfenv(1))
 
 local Event   = require('event')
diff --git a/sys/apps/builder.lua b/sys/apps/builder.lua
index 078650c..c43cbff 100644
--- a/sys/apps/builder.lua
+++ b/sys/apps/builder.lua
@@ -20,6 +20,11 @@ if Util.getVersion() == 1.8 then
   ChestProvider = require('chestProvider18')
 end
 
+if not turtle.point then
+  local Opus       = require('opus')
+  Opus.loadExtensions()
+end
+
 local BUILDER_DIR = 'usr/builder'
 
 local schematic = Schematic()
@@ -2034,6 +2039,7 @@ function startPage:eventHandler(event)
     Builder:build()
 
   elseif event.type == 'quit' then
+    UI.term:reset()
     Event.exitPullEvents()
   end
 
diff --git a/sys/apps/multishell b/sys/apps/multishell
index 4f80573..43f5d99 100644
--- a/sys/apps/multishell
+++ b/sys/apps/multishell
@@ -22,6 +22,7 @@ end
 requireInjector(getfenv(1))
 
 local Config = require('config')
+local Opus   = require('opus')
 local Util   = require('util')
 
 -- Begin multishell
@@ -462,27 +463,10 @@ end)
 local function startup()
   local hasError
 
-  local function runDir(directory, desc, open)
-    if not fs.exists(directory) then
-      return
-    end
-
-    local files = fs.list(directory)
-    table.sort(files)
-
-    for _,file in ipairs(files) do
-      print(desc .. file)
-      os.sleep(0)
-      local result, err = open(directory .. '/' .. file)
-      if not result then
-        printError(err)
-        hasError = true
-      end
-    end
+  if not Opus.loadExtensions() then
+    hasError = true
   end
 
-  runDir('sys/extensions', '[ ext ] ', shell.run)
-
   local overviewId = multishell.openTab({
     path = 'sys/apps/Overview.lua',
     focused = true,
@@ -491,9 +475,13 @@ local function startup()
   })
   overviewTab = tabs[overviewId]
 
-  runDir('sys/services', '[ svc ] ', shell.openHiddenTab)
-  runDir('sys/autorun', '[ aut ] ', shell.run)
-  runDir('usr/autorun', '[ aut ] ', shell.run)
+  if not Opus.loadServices() then
+    hasError = true
+  end
+
+  if not Opus.autorun() then
+    hasError = true
+  end
 
   if hasError then
     error('An autorun program has errored')
diff --git a/sys/extensions/clipboard.lua b/sys/extensions/clipboard.lua
index 6720276..c63c509 100644
--- a/sys/extensions/clipboard.lua
+++ b/sys/extensions/clipboard.lua
@@ -1,3 +1,7 @@
+if _G.clipboard then
+  return
+end
+
 requireInjector(getfenv(1))
 
 local Util = require('util')
@@ -32,6 +36,8 @@ function clipboard.useInternal(mode)
   end
 end
 
-multishell.addHotkey(20, function()
-  clipboard.useInternal(not clipboard.isInternal())
-end)
+if multishell and multishell.addHotkey then
+  multishell.addHotkey(20, function()
+    clipboard.useInternal(not clipboard.isInternal())
+  end)
+end
diff --git a/sys/extensions/device.lua b/sys/extensions/device.lua
index 06e8e75..0b1eee3 100644
--- a/sys/extensions/device.lua
+++ b/sys/extensions/device.lua
@@ -1,3 +1,7 @@
+if _G.device then
+  return
+end
+
 requireInjector(getfenv(1))
 
 local Peripheral = require('peripheral')
diff --git a/sys/extensions/pathfind.lua b/sys/extensions/pathfind.lua
index ef96342..bb0f3e4 100644
--- a/sys/extensions/pathfind.lua
+++ b/sys/extensions/pathfind.lua
@@ -1,4 +1,4 @@
-if not turtle then
+if not turtle or turtle.pathfind then
 	return
 end
 
diff --git a/sys/extensions/scheduler.lua b/sys/extensions/scheduler.lua
index 6a0a4a7..6669228 100644
--- a/sys/extensions/scheduler.lua
+++ b/sys/extensions/scheduler.lua
@@ -1,4 +1,4 @@
-if not turtle then
+if not turtle or turtle.abortAction then
   return
 end
 
diff --git a/sys/extensions/tgps.lua b/sys/extensions/tgps.lua
index fec95e9..f257236 100644
--- a/sys/extensions/tgps.lua
+++ b/sys/extensions/tgps.lua
@@ -1,4 +1,4 @@
-if not turtle then
+if not turtle or turtle.enableGPS then
   return
 end
 
diff --git a/sys/extensions/tl3.lua b/sys/extensions/tl3.lua
index 09ff41f..9166384 100644
--- a/sys/extensions/tl3.lua
+++ b/sys/extensions/tl3.lua
@@ -1,4 +1,4 @@
-if not turtle then
+if not turtle or turtle.getPoint then
   return
 end