diff --git a/Various/cfillion_Docker placeholders.lua b/Various/cfillion_Docker placeholders.lua
new file mode 100644
index 000000000..3273838aa
--- /dev/null
+++ b/Various/cfillion_Docker placeholders.lua	
@@ -0,0 +1,74 @@
+-- @description Docker placeholders
+-- @author cfillion
+-- @version 1.0
+-- @link Request thread https://forum.cockos.com/showthread.php?p=2693350
+-- @screenshot https://i.imgur.com/UxnT1pp.gif
+-- @donation https://reapack.com/donate
+-- @about
+--   # Docker placeholders
+--
+--   Open a placeholder window in any of REAPER's 16 dockers.
+
+local positions, placeholders = {
+  [-1]='not found',
+  [ 0]='bottom',
+  [ 1]='left',
+  [ 2]='top',
+  [ 3]='right',
+  [ 4]='floating'
+}, {}
+
+dofile(reaper.GetResourcePath() ..
+       '/Scripts/ReaTeam Extensions/API/imgui.lua')('0.8')
+
+local ImGui = {}
+for name, func in pairs(reaper) do
+  name = name:match('^ImGui_(.+)$')
+  if name then ImGui[name] = func end
+end
+
+local ctx = ImGui.CreateContext('Docker placeholder')
+
+local function checkbox(id)
+  local pos, toggled = positions[reaper.DockGetPosition(id)]
+  local label = ('Docker %02d: %s'):format(id + 1, pos)
+  toggled, placeholders[id] = ImGui.Checkbox(ctx, label, placeholders[id])
+end
+
+local function placeholder(id)
+  ImGui.SetNextWindowDockID(ctx, ~id)
+  local label = ('Docker %d'):format(id + 1)
+  local visible, open = ImGui.Begin(ctx, label, true,
+    ImGui.WindowFlags_NoSavedSettings() |
+    ImGui.WindowFlags_NoFocusOnAppearing())
+  if visible then
+    ImGui.Text(ctx, label)
+    ImGui.End(ctx)
+  end
+  if not open then
+    placeholders[id] = false
+  end
+end
+
+function loop()
+  local visible, open = ImGui.Begin(ctx, 'Docker placeholders', true,
+    ImGui.WindowFlags_AlwaysAutoResize())
+  if visible then
+    ImGui.TextWrapped(ctx, 'Click on a docker in the list below to open a placeholder window in that docker.')
+    ImGui.Spacing(ctx)
+    ImGui.PushStyleVar(ctx, ImGui.StyleVar_FramePadding(), 0, 0)
+    for i=0,15 do checkbox(i) end
+    ImGui.PopStyleVar(ctx)
+    ImGui.End(ctx)
+  end
+
+  for id, checked in pairs(placeholders) do
+    if checked then placeholder(id) end
+  end
+
+  if open then
+    reaper.defer(loop)
+  end
+end
+
+reaper.defer(loop)