diff --git a/Zenitha b/Zenitha
index 123e60be..ce22dfac 160000
--- a/Zenitha
+++ b/Zenitha
@@ -1 +1 @@
-Subproject commit 123e60be43c06f11b51c3073527061cf4be0eaf6
+Subproject commit ce22dfaccd26762673319f75d17a2cc52a1bf1b9
diff --git a/conf.lua b/conf.lua
index e7d97a6c..5836c387 100644
--- a/conf.lua
+++ b/conf.lua
@@ -1,3 +1,16 @@
+ShellOption=require'shell'
+
+if ShellOption.bootDisabled then
+    function love.conf(t)
+        for k in next,t.modules do t.modules[k]=false end
+        t.window.vsync=0
+        t.window.msaa=0
+        t.window.depth=0
+        t.window.stencil=0
+    end
+    return
+end
+
 if love._os=='Web' then
     local oldRead=love.filesystem.read
     love.filesystem[('read')]=function(name,size)
diff --git a/main.lua b/main.lua
index 7c0806fc..ed7e4e0f 100644
--- a/main.lua
+++ b/main.lua
@@ -22,6 +22,11 @@
 -- 5. Readability and Maintainability are not always put to the first place. Codes around hot spot could be optimized for better performance. sorry if it confused you;
 -- 6. 26
 
+if not love.window then
+    love[('run')]=function() return function() return true end end
+    return
+end
+
 -------------------------------------------------------------
 -- Load Zenitha
 
@@ -491,12 +496,21 @@ for _,v in next,love.filesystem.getDirectoryItems('assets/scene') do
         SCN.add(sceneName,FILE.load('assets/scene/'..v,'-lua'))
     end
 end
+local appletSceneSet={} ---@type Set<string>
 for _,v in next,love.filesystem.getDirectoryItems('assets/scene_app') do
     if FILE.isSafe('assets/scene_app/'..v) then
         local sceneName=v:sub(1,-5)
+        appletSceneSet[sceneName]=true
         SCN.add(sceneName,FILE.load('assets/scene_app/'..v,'-lua'))
     end
 end
+if PROGRESS.get('main')>=3 and ShellOption.launchApplet then
+    if appletSceneSet[ShellOption.launchApplet] then
+        ZENITHA.setFirstScene(ShellOption.launchApplet)
+    else
+        MSG('error',"Applet scene '"..ShellOption.launchApplet.."' doesn't exist")
+    end
+end
 
 for _,v in next,{
     'brik_template', -- Shouldn't be used
diff --git a/shell.lua b/shell.lua
new file mode 100644
index 00000000..b56e458c
--- /dev/null
+++ b/shell.lua
@@ -0,0 +1,113 @@
+-- [WARNING] Run before main.lua
+
+function simpRequire(path)
+    return function(module) return require(path..module) end
+end
+local _require=require
+local require=simpRequire('Zenitha.')
+STRING=require'stringExtend'
+TABLE=require'tableExtend'
+AE=require'escape'
+
+local stdout=io.stdout
+function write(text)
+    stdout:write(text)
+    stdout:flush()
+end
+local function sleep(time)
+    if love._os=='Linux' then
+        os.execute('sleep '..time)
+    else
+        local fin=os.clock()+time
+        repeat until os.clock()>fin
+    end
+end
+local function feed(...)
+    local d={...}
+    for i=1,#d do
+        if type(d[i])=='number' then
+            sleep(d[i])
+        else
+            write(d[i])
+        end
+    end
+end
+
+local rArg=TABLE.sub(arg,(arg[-2]=='love' or arg[-1]=='love') and 2 or 1)
+
+for k,v in next,rArg do print(k,v)end
+
+local option={}
+
+local commands={}
+function commands.help()
+    option.bootDisabled=true
+    feed(
+        "\n",
+        AE[533].."TechOS"..AE.." help page\n",
+        .260,
+        "[no args]        "..AE._d"Start default booting process\n",
+        "-h, --help       "..AE._d"Show this help message then exit\n",
+        "-v, --version    "..AE._d"Show version information then exit\n",
+        "-s, --shell      "..AE._d"Start the interactive shell\n",
+        .120
+    )
+end
+function commands.version()
+    option.bootDisabled=true
+    sleep(.1)
+    print(("TechOS %s (%s)"):format(_require'version'.appVer,_require'version'.verCode))
+end
+function commands.shell()
+    feed(
+        .000,AE[425]..  " _____         _         _          "..AE._d"  _  "..AE[005].."  _____     _",
+        .260,AE[425].."\n|_   _|___ ___| |_ _____|_|___ ___  "..AE._d" |_| "..AE[005].." |   __|___| |___ _ _ _ _",
+        .120,AE[425].."\n  | | | -_|  _|   |     | |   | . | "..AE._d"  _  "..AE[005].." |  |  | .'| | .'|_'_| | |",
+        .120,AE[425].."\n  |_| |___|___|_|_|_|_|_|_|_|_|___| "..AE._d" |_| "..AE[005].." |_____|__,|_|__,|_,_|_  |",
+        .120,AE[533].."\n  The ultra-improved version of Techmino, for YOU."..AE[005]..         "            |___|",
+        .620,AE.."\n\nWelcome to the TechOS shell!\n",.260
+    )
+    while true do
+        write("\n> ")
+        local input=io.read()
+        if input~='' then
+            local args=STRING.split(input,' ')
+            if args[1]=='help' then
+                feed(
+                    "Available Commands:\n",
+                    "help      Show this help message\n",
+                    "start     Continue normal booting process\n",
+                    "exit      Interrupt booting process and exit shell\n"
+                )
+            elseif args[1]=='start' then
+                if args[2]=='app' then
+                    option.launchApplet=args[3]
+                end
+                feed(.1,"Starting application...\n",.1)
+                break
+            elseif args[1]=='exit' then
+                print("Exiting shell...")
+                option.bootDisabled=true
+                break
+            else
+                print("Unknown command. Try 'help'")
+            end
+        end
+    end
+end
+function commands.unknown()
+    print("Unknown switch. Run with '--help' for help.")
+    option.bootDisabled=true
+end
+
+if     rArg[1]=="-h" or rArg[1]=="--help" then
+    commands.help()
+elseif rArg[1]=='-s' or rArg[1]=='--shell' then
+    commands.shell()
+elseif rArg[1]=='-v' or rArg[1]=='--version' then
+    commands.version()
+else
+    commands.unknown()
+end
+
+return option