diff --git a/sys/apis/fs/linkfs.lua b/sys/apis/fs/linkfs.lua
index e46342c..38cceac 100644
--- a/sys/apis/fs/linkfs.lua
+++ b/sys/apis/fs/linkfs.lua
@@ -2,6 +2,8 @@ local fs = _G.fs
 
 local linkfs = { }
 
+-- TODO: implement broken links
+
 local methods = { 'exists', 'getFreeSpace', 'getSize',
 	'isDir', 'isReadOnly', 'list', 'listEx', 'makeDir', 'open', 'getDrive' }
 
diff --git a/sys/apis/peripheral.lua b/sys/apis/peripheral.lua
index a176268..6e73a0e 100644
--- a/sys/apis/peripheral.lua
+++ b/sys/apis/peripheral.lua
@@ -17,53 +17,59 @@ end
 
 function Peripheral.addDevice(deviceList, side)
 	local name = side
-	local ptype = Peripheral.getType(side)
+	pcall(function()
+		local ptype = Peripheral.getType(side)
+		local dev = Peripheral.wrap(side)
 
-	if not ptype then
-		return
-	end
-
-	if ptype == 'modem' then
-		if not Peripheral.call(name, 'isWireless') then
---			ptype = 'wireless_modem'
---		else
-			ptype = 'wired_modem'
+		if not ptype or not dev then
+			return
 		end
-	end
 
-	local sides = {
-		front = true,
-		back = true,
-		top = true,
-		bottom = true,
-		left = true,
-		right = true
-	}
-
-	if sides[name] then
-		local i = 1
-		local uniqueName = ptype
-		while deviceList[uniqueName] do
-			uniqueName = ptype .. '_' .. i
-			i = i + 1
+		if ptype == 'modem' then
+			if not Peripheral.call(name, 'isWireless') then
+	--			ptype = 'wireless_modem'
+	--		else
+				ptype = 'wired_modem'
+				if dev.getMetadata then
+					-- avoid open computer relays being registered
+					-- as 'wired_modem'
+					ptype = dev.getMetadata().name or 'wired_modem'
+				end
+			end
 		end
-		name = uniqueName
-	end
 
-	-- this can randomly fail
-	if not deviceList[name] then
-		pcall(function()
-			deviceList[name] = Peripheral.wrap(side)
-		end)
+		local sides = {
+			front = true,
+			back = true,
+			top = true,
+			bottom = true,
+			left = true,
+			right = true
+		}
 
-		if deviceList[name] then
-			Util.merge(deviceList[name], {
-				name = name,
-				type = ptype,
-				side = side,
-			})
+		if sides[name] then
+			local i = 1
+			local uniqueName = ptype
+			while deviceList[uniqueName] do
+				uniqueName = ptype .. '_' .. i
+				i = i + 1
+			end
+			name = uniqueName
 		end
-	end
+
+		-- this can randomly fail
+		if not deviceList[name] then
+				deviceList[name] = dev
+
+			if deviceList[name] then
+				Util.merge(deviceList[name], {
+					name = name,
+					type = ptype,
+					side = side,
+				})
+			end
+		end
+	end)
 
 	return deviceList[name]
 end
@@ -117,4 +123,4 @@ function Peripheral.get(args)
 	end
 end
 
-return Peripheral
+return Peripheral
\ No newline at end of file
diff --git a/sys/apis/util.lua b/sys/apis/util.lua
index 2a3fb64..a15e1e2 100644
--- a/sys/apis/util.lua
+++ b/sys/apis/util.lua
@@ -659,6 +659,37 @@ function Util.wordWrap(str, limit)
 	return lines
 end
 
+-- https://github.com/MightyPirates/OpenComputers
+function Util.parse(...)
+  local params = table.pack(...)
+  local args = {}
+  local options = {}
+  local doneWithOptions = false
+  for i = 1, params.n do
+    local param = params[i]
+    if not doneWithOptions and type(param) == "string" then
+      if param == "--" then
+        doneWithOptions = true -- stop processing options at `--`
+      elseif param:sub(1, 2) == "--" then
+        local key, value = param:match("%-%-(.-)=(.*)")
+        if not key then
+          key, value = param:sub(3), true
+        end
+        options[key] = value
+      elseif param:sub(1, 1) == "-" and param ~= "-" then
+        for j = 2, string.len(param) do
+          options[string.sub(param, j, j)] = true
+        end
+      else
+        table.insert(args, param)
+      end
+    else
+      table.insert(args, param)
+    end
+  end
+  return args, options
+end
+
 function Util.args(arg)
 	local options, args = { }, { }
 
diff --git a/sys/apps/Help.lua b/sys/apps/Help.lua
index cdb5de7..b43d23a 100644
--- a/sys/apps/Help.lua
+++ b/sys/apps/Help.lua
@@ -1,8 +1,8 @@
 local UI    = require('ui')
 local Util  = require('util')
 
-local colors     = _G.colors
-local help       = _G.help
+local colors = _G.colors
+local help   = _G.help
 
 UI:configure('Help', ...)
 
@@ -40,7 +40,7 @@ local topicPage = UI.Page {
 	backgroundColor = colors.black,
 	titleBar = UI.TitleBar {
 		title = 'text',
-		previousPage = true,
+		event = 'back',
 	},
 	helpText = UI.TextArea {
 		backgroundColor = colors.black,
@@ -52,9 +52,18 @@ local topicPage = UI.Page {
 	},
 }
 
+function topicPage:enable(name)
+	local f = help.lookup(name)
+
+	self.titleBar.title = name
+	self.helpText:setText(f and Util.readFile(f) or 'No help available for ' .. name)
+
+	return UI.Page.enable(self)
+end
+
 function topicPage:eventHandler(event)
 	if event.type == 'back' then
-		UI:setPreviousPage()
+		UI:setPage(page)
 	end
 	return UI.Page.eventHandler(self, event)
 end
@@ -66,12 +75,8 @@ function page:eventHandler(event)
 	elseif event.type == 'grid_select' then
 		if self.grid:getSelected() then
 			local name = self.grid:getSelected().name
-			local f = help.lookup(name)
 
-			topicPage.titleBar.title = name
-			topicPage.helpText:setText(Util.readFile(f))
-
-			UI:setPage(topicPage)
+			UI:setPage(topicPage, name)
 		end
 
 	elseif event.type == 'text_change' then
@@ -93,5 +98,6 @@ function page:eventHandler(event)
 	end
 end
 
-UI:setPage(page)
+local args = { ... }
+UI:setPage(#args[1] and topicPage or page, args[1])
 UI:pullEvents()
diff --git a/sys/apps/autorun.lua b/sys/apps/autorun.lua
index e7febc1..40e0e74 100644
--- a/sys/apps/autorun.lua
+++ b/sys/apps/autorun.lua
@@ -55,7 +55,7 @@ runDir('usr/autorun')
 
 if not success then
   if multishell then
-    --multishell.setFocus(multishell.getCurrent())
+    multishell.setFocus(multishell.getCurrent())
   end
   _G.printError('A startup program has errored')
   print('Press enter to continue')
diff --git a/sys/apps/system/aliases.lua b/sys/apps/system/aliases.lua
index 0523f27..3a98bc6 100644
--- a/sys/apps/system/aliases.lua
+++ b/sys/apps/system/aliases.lua
@@ -1,6 +1,8 @@
 local Config = require('config')
 local UI     = require('ui')
 
+local kernel = _G.kernel
+
 local aliasTab = UI.Tab {
 	tabTitle = 'Aliases',
 	description = 'Shell aliases',
@@ -33,8 +35,12 @@ local aliasTab = UI.Tab {
 function aliasTab.grid:draw()
 	self.values = { }
 	local env = Config.load('shell')
+	for k in pairs(kernel.getShell().aliases()) do
+		kernel.getShell().clearAlias(k)
+	end
 	for k,v in pairs(env.aliases) do
 		table.insert(self.values, { alias = k, path = v })
+		kernel.getShell().setAlias(k, v)
 	end
 	self:update()
 	UI.Grid.draw(self)
@@ -42,23 +48,23 @@ end
 
 function aliasTab:eventHandler(event)
 	if event.type == 'delete_alias' then
-		local env = Config.load('shell')
+		local env = Config.load('shell', { aliases = { } })
 		env.aliases[self.grid:getSelected().alias] = nil
+		Config.update('shell', env)
 		self.grid:setIndex(self.grid:getIndex())
 		self.grid:draw()
-		Config.update('shell', env)
-		self:emit({ type = 'success_message', message = 'reboot to take effect' })
+		self:emit({ type = 'success_message', message = 'Aliases updated' })
 		return true
 
 	elseif event.type == 'new_alias' then
-		local env = Config.load('shell')
+		local env = Config.load('shell', { aliases = { } })
 		env.aliases[self.alias.value] = self.path.value
+		Config.update('shell', env)
 		self.alias:reset()
 		self.path:reset()
 		self:draw()
 		self:setFocus(self.alias)
-		Config.update('shell', env)
-		self:emit({ type = 'success_message', message = 'reboot to take effect' })
+		self:emit({ type = 'success_message', message = 'Aliases updated' })
 		return true
 	end
 end
diff --git a/sys/init/2.vfs.lua b/sys/init/2.vfs.lua
index d80474c..a42e59e 100644
--- a/sys/init/2.vfs.lua
+++ b/sys/init/2.vfs.lua
@@ -287,6 +287,7 @@ function fs.mount(path, fstype, ...)
 			tp.nodes[targetName] = node
 		end
 	end
+_debug(node)
 	return node
 end
 
diff --git a/sys/init/3.relay.lua b/sys/init/3.relay.lua
new file mode 100644
index 0000000..8a65f36
--- /dev/null
+++ b/sys/init/3.relay.lua
@@ -0,0 +1,27 @@
+local device     = _G.device
+local kernel     = _G.kernel
+
+local function register(v)
+  if v and v.isWireless and v.getMetadata and v.getNamesRemote then
+    v.children = { }
+    for _, name in pairs(v.getNamesRemote()) do
+      local dev = v.getMethodsRemote(name)
+      if dev then
+        dev.name = name
+        dev.side = name
+        dev.type = v.getTypeRemote(name)
+        device[name] = dev
+        table.insert(v._children, dev)
+      end
+    end
+  end
+end
+
+for _,v in pairs(device) do
+  register(v)
+end
+
+-- register oc devices as peripherals
+kernel.hook('device_attach', function(_, eventData)
+  register(device[eventData[2]])
+end)
diff --git a/sys/init/7.multishell.lua b/sys/init/7.multishell.lua
index 9d48ce0..d9a2536 100644
--- a/sys/init/7.multishell.lua
+++ b/sys/init/7.multishell.lua
@@ -123,23 +123,25 @@ function multishell.openTab(tab)
 	local routine = kernel.newRoutine(tab)
 
 	routine.co = coroutine.create(function()
-		local result, err, stacktrace
+		local result, err
 
 		if tab.fn then
 			result, err = Util.runFunction(routine.env, tab.fn, table.unpack(tab.args or { } ))
 		elseif tab.path then
-			result, err, stacktrace = xprun(routine.env, tab.path, table.unpack(tab.args or { } ))
+			result, err = xprun(routine.env, tab.path, table.unpack(tab.args or { } ))
 		else
 			err = 'multishell: invalid tab'
 		end
 
-		if not result and err and err ~= 'Terminated' then
-			if err then
+		if not result and err and err ~= 'Terminated' or (err and err ~= 0) then
+			tab.terminal.setBackgroundColor(colors.black)
+			if tonumber(err) then
+				tab.terminal.setTextColor(colors.orange)
+				print('Process exited with error code: ' .. err)
+			elseif err then
 				printError(tostring(err))
-				if stacktrace then -- alternatively log stack to _debug
-					--print('\n' .. stacktrace)
-				end
 			end
+			tab.terminal.setTextColor(colors.white)
 			print('\nPress enter to close')
 			routine.isDead = true
 			routine.hidden = false