diff --git a/sys/apis/fs/netfs.lua b/sys/apis/fs/netfs.lua
index 28f64c3..01b5218 100644
--- a/sys/apis/fs/netfs.lua
+++ b/sys/apis/fs/netfs.lua
@@ -29,7 +29,7 @@ local function remoteCommand(node, msg)
   error('netfs: Connection failed', 2)
 end
 
-local methods = { 'delete', 'exists', 'getFreeSpace', 'getSize', 'makeDir' }
+local methods = { 'delete', 'exists', 'getFreeSpace', 'makeDir' }
 
 local function resolveDir(dir, node)
   dir = dir:gsub(node.mountPoint, '', 1)
@@ -101,6 +101,16 @@ function netfs.isReadOnly(node, dir)
   })
 end
 
+function netfs.getSize(node, dir)
+  if dir == node.mountPoint and node.directory == '' then
+    return 0
+  end
+  return remoteCommand(node, {
+    fn = 'getSize',
+    args = { resolveDir(dir, node) },
+  })
+end
+
 function netfs.find(node, spec)
   spec = resolveDir(spec, node)
   local list = remoteCommand(node, {
diff --git a/sys/apis/meProvider.lua b/sys/apis/meProvider.lua
index 826df0c..2b82950 100644
--- a/sys/apis/meProvider.lua
+++ b/sys/apis/meProvider.lua
@@ -1,16 +1,40 @@
 local class = require('class')
 local Logger = require('logger')
+local Peripheral = require('peripheral')
 
 local MEProvider = class()
 
 function MEProvider:init(args)
-  self.items = {}
-  self.name = 'ME'
+  local defaults = {
+    items = { },
+    name = 'ME',
+  }
+  Util.merge(self, defaults)
+  Util.merge(self, args)
+
+  if self.side then
+    local mep = peripheral.wrap('bottom')
+    if mep then
+      Util.merge(self, mep)
+    end
+  else
+    local mep = Peripheral.getByMethod('getAvailableItems')
+    if mep then
+      Util.merge(self, mep)
+    end
+  end
+
+  if self.side then
+    local sides = {
+      top = 'down',
+      bottom = 'up',
+    }
+    self.oside = sides[self.side]
+  end
 end
  
 function MEProvider:isValid()
-  local mep = peripheral.wrap('bottom')
-  return mep and mep.getAvailableItems and mep.getAvailableItems()
+  return self.getAvailableItems and self.getAvailableItems()
 end
 
 -- Strip off color prefix
@@ -32,16 +56,18 @@ local function safeString(text)
 end
 
 function MEProvider:refresh()
-  local mep = peripheral.wrap('bottom')
-  if mep then
-    self.items = mep.getAvailableItems('all')
-    for _,v in pairs(self.items) do
-      Util.merge(v, v.item)
-      v.name = safeString(v.display_name)
-    end
+  self.items = self.getAvailableItems('all')
+  for _,v in pairs(self.items) do
+    Util.merge(v, v.item)
+    v.name = safeString(v.display_name)
   end
   return self.items
 end
+
+function MEProvider:listItems()
+  self:refresh()
+  return self.items
+end
  
 function MEProvider:getItemInfo(id, dmg)
  
@@ -60,21 +86,14 @@ function MEProvider:craft(id, dmg, qty)
 
   if item and item.is_craftable then
 
-    local mep = peripheral.wrap('bottom')
-    if mep then
-      Logger.log('meProvideer', 'requested crafting for: ' .. id .. ':' .. dmg .. ' qty: ' .. qty)
-      mep.requestCrafting({ id = id, dmg = dmg }, qty)
-      return true
-    end
+    Logger.log('MEProvider', 'requested crafting for: ' .. id .. ':' .. dmg .. ' qty: ' .. qty)
+    self.requestCrafting({ id = id, dmg = dmg }, qty)
+    return true
   end
-
-  return false
 end
 
 function MEProvider:craftItems(items)
-  local mep = peripheral.wrap('bottom')
-
-  local cpus = mep.getCraftingCPUs() or { }
+  local cpus = self.getCraftingCPUs() or { }
   local count = 0
 
   for _,cpu in pairs(cpus) do
@@ -94,42 +113,29 @@ function MEProvider:craftItems(items)
 end
 
 function MEProvider:provide(item, qty, slot)
-  local mep = peripheral.wrap('bottom')
-  if mep then
-    return pcall(function()
-      mep.exportItem({
-        id = item.id,
-        dmg = item.dmg
-      },
-      'up',
-      qty,
-      slot)
-    end)
-
-    --if item.qty then
-    --  item.qty = item.qty - extractedQty
-    --end
-  end
+  return pcall(function()
+    self.exportItem({
+      id = item.id,
+      dmg = item.dmg
+    }, self.oside, qty, slot)
+  end)
 end
  
 function MEProvider:insert(slot, qty)
-  local mep = peripheral.wrap('bottom')
-  if mep then
-    local s, m = pcall(function() mep.pullItem('up', slot, qty) end)
+  local s, m = pcall(function() self.pullItem(self.oside, slot, qty) end)
+  if not s and m then
+    print('MEProvider:pullItem')
+    print(m)
+    Logger.log('MEProvider', 'Insert failed, trying again')
+    sleep(1)
+    s, m = pcall(function() self.pullItem('up', slot, qty) end)
     if not s and m then
-      print('meProvider:pullItem')
+      print('MEProvider:pullItem')
       print(m)
-      Logger.log('meProvider', 'Insert failed, trying again')
-      sleep(1)
-      s, m = pcall(function() mep.pullItem('up', slot, qty) end)
-      if not s and m then
-        print('meProvider:pullItem')
-        print(m)
-        Logger.log('meProvider', 'Insert failed again')
-        read()
-      else
-        Logger.log('meProvider', 'Insert successful')
-      end
+      Logger.log('MEProvider', 'Insert failed again')
+      read()
+    else
+      Logger.log('MEProvider', 'Insert successful')
     end
   end
 end
diff --git a/sys/apps/Appstore.lua b/sys/apps/Appstore.lua
index f344242..c2f2ff0 100644
--- a/sys/apps/Appstore.lua
+++ b/sys/apps/Appstore.lua
@@ -1,8 +1,6 @@
 require = requireInjector(getfenv(1))
 local Util = require('util')
-local class = require('class')
 local UI = require('ui')
-local Event = require('event')
 
 local sandboxEnv = Util.shallowCopy(getfenv(1))
 setmetatable(sandboxEnv, { __index = _G })
@@ -10,12 +8,14 @@ setmetatable(sandboxEnv, { __index = _G })
 multishell.setTitle(multishell.getCurrent(), 'App Store')
 UI:configure('Appstore', ...)
 
+local APP_DIR = 'usr/apps'
+
 local sources = {
 
   { text = "STD Default",
     event = 'source',
     url = "http://pastebin.com/raw/zVws7eLq" }, --stock
-
+--[[
   { text = "Discover",
     event = 'source',
     generateName = true,
@@ -24,9 +24,10 @@ local sources = {
   { text = "Opus",
     event = 'source',
     url = "http://pastebin.com/raw/ajQ91Rmn" },
+]]
 }
 
-shell.setDir('/apps')
+shell.setDir(APP_DIR)
 
 function downloadApp(app)
   local h
@@ -49,8 +50,8 @@ function runApp(app, checkExists, ...)
   local path, fn
   local args = { ... }
 
-  if checkExists and fs.exists(fs.combine('/apps', app.name)) then
-    path = fs.combine('/apps', app.name)
+  if checkExists and fs.exists(fs.combine(APP_DIR, app.name)) then
+    path = fs.combine(APP_DIR, app.name)
   else
     local program = downloadApp(app)
 
@@ -89,7 +90,7 @@ local installApp = function(app)
     return false, "Failed to download"
   end
 
-  local fullPath = fs.combine('/apps', app.name)
+  local fullPath = fs.combine(APP_DIR, app.name)
   Util.writeFile(fullPath, program)
   return true, 'Installed as ' .. fullPath
 end
@@ -103,6 +104,7 @@ local viewApp = function(app)
 
   Util.writeFile('/.source', program)
   shell.openForegroundTab('edit /.source')
+  fs.delete('/.source')
   return true
 end
 
@@ -190,7 +192,7 @@ function appPage:enable(source, app)
   UI.Page.enable(self)
 
   self.container.viewport:setScrollPosition(0)
-  if fs.exists(fs.combine('/apps', app.name)) then
+  if fs.exists(fs.combine(APP_DIR, app.name)) then
     self.menuBar.removeButton:enable('Remove')
   else
     self.menuBar.removeButton:disable('Remove')
@@ -215,13 +217,13 @@ function appPage:eventHandler(event)
     if self.app.runOnly then
       s,m = runApp(self.app, false, 'uninstall')
     else
-      fs.delete(fs.combine('/apps', self.app.name))
+      fs.delete(fs.combine(APP_DIR, self.app.name))
       self.notification:success("Uninstalled " .. self.app.name, 3)
       self:focusFirst(self)
       self.menuBar.removeButton:disable('Remove')
       self.menuBar:draw()
 
-      os.unregisterApp(fs.combine('/apps', self.app.name))
+      os.unregisterApp(self.app.creator .. '.' .. self.app.name)
     end
 
   elseif event.type == 'install' then
@@ -246,11 +248,11 @@ function appPage:eventHandler(event)
         end
 
         os.registerApp({
-          run = fs.combine('/apps', self.app.name),
+          run = fs.combine(APP_DIR, self.app.name),
           title = self.app.title,
           category = category,
           icon = self.app.icon,
-        })
+        }, self.app.creator .. '.' .. self.app.name)
       end
     else
       self.notification:error(m, 3)
@@ -348,7 +350,7 @@ function categoryPage.grid:sortCompare(a, b)
 end
 
 function categoryPage.grid:getRowTextColor(row, selected)
-  if fs.exists(fs.combine('/apps', row.name)) then
+  if fs.exists(fs.combine(APP_DIR, row.name)) then
     return colors.orange
   end
   return UI.Grid:getRowTextColor(row, selected)
@@ -370,7 +372,7 @@ function categoryPage:eventHandler(event)
     self:draw()
 
   elseif event.type == 'quit' then
-    Event.exitPullEvents()
+    UI:exitPullEvents()
 
   else
     return UI.Page.eventHandler(self, event)
@@ -382,5 +384,5 @@ print("Retrieving catalog list")
 categoryPage:setSource(sources[1])
 
 UI:setPage(categoryPage)
-Event.pullEvents()
+UI:pullEvents()
 UI.term:reset()
diff --git a/sys/apps/Overview.lua b/sys/apps/Overview.lua
index 4bc754a..00fb107 100644
--- a/sys/apps/Overview.lua
+++ b/sys/apps/Overview.lua
@@ -158,8 +158,8 @@ function page.container:setCategory(categoryName)
     filtered = { }
 
     for _,v in ipairs(config.Recent) do
-      local app = Util.find(applications, 'run', v)
-      if app and fs.exists(app.run) then
+      local app = Util.find(applications, 'key', v)
+      if app then -- and fs.exists(app.run) then
         table.insert(filtered, app)
       end
     end
@@ -273,12 +273,12 @@ function page:eventHandler(event)
 
   elseif event.type == 'button' then
     for k,v in ipairs(config.Recent) do
-      if v == event.button.app.run then
+      if v == event.button.app.key then
         table.remove(config.Recent, k)
         break
       end
     end
-    table.insert(config.Recent, 1, event.button.app.run)
+    table.insert(config.Recent, 1, event.button.app.key)
     if #config.Recent > maxRecent then
       table.remove(config.Recent, maxRecent + 1)
     end
diff --git a/sys/apps/Script.lua b/sys/apps/Script.lua
index 519c8fe..7b6d989 100644
--- a/sys/apps/Script.lua
+++ b/sys/apps/Script.lua
@@ -5,7 +5,7 @@ local Socket = require('socket')
 local Config = require('config')
 
 local GROUPS_PATH = 'usr/groups'
-local SCRIPTS_PATH = 'usr/scripts'
+local SCRIPTS_PATH = 'sys/etc/scripts'
 
 multishell.setTitle(multishell.getCurrent(), 'Script')
 UI:configure('script', ...)
diff --git a/sys/apps/shell b/sys/apps/shell
index 9cdd65f..c76368c 100644
--- a/sys/apps/shell
+++ b/sys/apps/shell
@@ -79,14 +79,11 @@ end
 
 function shell.resolveProgram( _sCommand )
 
-  local sPath = PATH or ''
-
   if ALIASES[ _sCommand ] ~= nil then
     _sCommand = ALIASES[ _sCommand ]
   end
 
   local path = shell.resolve(_sCommand)
-
   if fs.exists(path) and not fs.isDir(path) then
     return path
   end
@@ -104,9 +101,9 @@ function shell.resolveProgram( _sCommand )
     return nil
   end
   
--- Otherwise, look on the path variable
-  for sPath in string.gmatch(sPath, "[^:]+") do
-    sPath = fs.combine( shell.resolve(sPath), _sCommand )
+  -- Otherwise, look on the path variable
+  for sPath in string.gmatch(PATH or '', "[^:]+") do
+    sPath = fs.combine(sPath, _sCommand )
     if fs.exists( sPath ) and not fs.isDir( sPath ) then
       return sPath
     end
diff --git a/sys/extensions/os.lua b/sys/extensions/os.lua
index a8e8929..4b82552 100644
--- a/sys/extensions/os.lua
+++ b/sys/extensions/os.lua
@@ -1,5 +1,8 @@
 require = requireInjector(getfenv(1))
 local Config = require('config')
+local SHA1 = require('sha1')
+
+local REGISTRY_DIR = 'usr/.registry'
 
 local config = {
   enable = false,
@@ -13,7 +16,6 @@ function lockScreen()
   require = requireInjector(getfenv(1))
   local UI = require('ui')
   local Event = require('event')
-  local SHA1 = require('sha1')
 
   local center = math.floor(UI.term.width / 2)
 
@@ -153,45 +155,20 @@ end
 
 -- move completely into overview
 -- just post event from appstore
-function os.registerApp(entry)
-  local apps = { }
-  Config.load('apps', apps)
-
-  local run = fs.combine(entry.run, '')
-
-  for k,app in pairs(apps) do
-    if app.run == run then
-      table.remove(apps, k)
-      break
-    end
-  end
-
-  table.insert(apps, {
-    run = run,
-    title = entry.title,
-    args = entry.args,
-    category = entry.category,
-    icon = entry.icon,
-  })
-
-  Config.update('apps', apps)
+function os.registerApp(app, key)
 
+  app.key = SHA1.sha1(key)
+debug(fs.combine(REGISTRY_DIR, app.key))
+debug(app)
+  Util.writeTable(fs.combine(REGISTRY_DIR, app.key), app)
   os.queueEvent('os_register_app')
 end
 
-function os.unregisterApp(run)
+function os.unregisterApp(key)
 
-  local apps = { }
-  Config.load('apps', apps)
-
-  local run = fs.combine(run, '')
-
-  for k,app in pairs(apps) do
-    if app.run == run then
-      table.remove(apps, k)
-      Config.update('apps', apps)
-      os.queueEvent('os_register_app')
-      break
-    end
+  local filename = fs.combine(REGISTRY_DIR, SHA1.sha1(key))
+  if fs.exists(filename) then
+    fs.delete(filename)
+    os.queueEvent('os_register_app')
   end
 end