diff --git a/source/backend/CarlaPlugin.hpp b/source/backend/CarlaPlugin.hpp
index 722503863..0bc2ed047 100644
--- a/source/backend/CarlaPlugin.hpp
+++ b/source/backend/CarlaPlugin.hpp
@@ -423,7 +423,7 @@ public:
      *
      * @see getId()
      */
-    void setId(const uint newId) noexcept;
+    virtual void setId(const uint newId) noexcept;
 
     /*!
      * Set the plugin's name to @a newName.
@@ -838,6 +838,13 @@ public:
      */
     virtual const void* getNativeDescriptor() const noexcept;
 
+    /*!
+     * Get the plugin UI bridge process Id.
+     */
+    virtual uintptr_t getUiBridgeProcessId() const noexcept;
+
+    // -------------------------------------------------------------------
+
     /*!
      * Get the plugin's patchbay nodeId.
      * @see setPatchbayNodeId()
diff --git a/source/backend/plugin/CarlaPlugin.cpp b/source/backend/plugin/CarlaPlugin.cpp
index 5444d26dd..ddc016a49 100644
--- a/source/backend/plugin/CarlaPlugin.cpp
+++ b/source/backend/plugin/CarlaPlugin.cpp
@@ -1351,13 +1351,7 @@ void CarlaPlugin::idle()
     CarlaString uiTitle(pData->name);
     uiTitle += " (GUI)";
 
-    uint32_t pid = 0;
-#ifndef BUILD_BRIDGE
-    if (pData->oscData.target != nullptr && pData->childProcess != nullptr)
-        pid = pData->childProcess->getPID();
-#endif
-
-    if (CarlaPluginUI::tryTransientWinIdMatch(pid, uiTitle, pData->engine->getOptions().frontendWinId, true))
+    if (CarlaPluginUI::tryTransientWinIdMatch(getUiBridgeProcessId(), uiTitle, pData->engine->getOptions().frontendWinId, true))
         pData->transientTryCounter = 0;
 }
 
@@ -1891,6 +1885,13 @@ const void* CarlaPlugin::getNativeDescriptor() const noexcept
     return nullptr;
 }
 
+uintptr_t CarlaPlugin::getUiBridgeProcessId() const noexcept
+{
+    return 0;
+}
+
+// -------------------------------------------------------------------
+
 uint32_t CarlaPlugin::getPatchbayNodeId() const noexcept
 {
     return pData->nodeId;
diff --git a/source/backend/plugin/CarlaPluginDSSI.cpp b/source/backend/plugin/CarlaPluginDSSI.cpp
index 942bd3eb0..5b5ae17a1 100644
--- a/source/backend/plugin/CarlaPluginDSSI.cpp
+++ b/source/backend/plugin/CarlaPluginDSSI.cpp
@@ -350,7 +350,13 @@ public:
     // -------------------------------------------------------------------
     // Set data (internal stuff)
 
-    // nothing
+    void setId(const uint newId) noexcept
+    {
+        CarlaPlugin::setId(newId);
+
+        // UI osc-url uses Id, so we need to close it when it changes
+        showCustomUI(false);
+    }
 
     // -------------------------------------------------------------------
     // Set data (plugin-specific stuff)
@@ -2026,6 +2032,11 @@ public:
         return fDssiDescriptor;
     }
 
+    uintptr_t getUiBridgeProcessId() const noexcept override
+    {
+        return (pData->oscData.target != nullptr && pData->childProcess != nullptr) ? pData->childProcess->getPID() : 0;
+    }
+
     const void* getExtraStuff() const noexcept override
     {
         return fUiFilename;
diff --git a/source/backend/plugin/CarlaPluginLV2.cpp b/source/backend/plugin/CarlaPluginLV2.cpp
index c207da8c4..57beafed0 100644
--- a/source/backend/plugin/CarlaPluginLV2.cpp
+++ b/source/backend/plugin/CarlaPluginLV2.cpp
@@ -4621,6 +4621,11 @@ public:
         return fDescriptor;
     }
 
+    uintptr_t getUiBridgeProcessId() const noexcept override
+    {
+        return fPipeServer.isPipeRunning() ? fPipeServer.getPID() : 0;
+    }
+
     // -------------------------------------------------------------------
 
 public:
diff --git a/source/utils/CarlaPipeUtils.cpp b/source/utils/CarlaPipeUtils.cpp
index 2e39e35f4..47df5acf2 100644
--- a/source/utils/CarlaPipeUtils.cpp
+++ b/source/utils/CarlaPipeUtils.cpp
@@ -1050,6 +1050,15 @@ CarlaPipeServer::~CarlaPipeServer() /*noexcept*/
     stopPipeServer(5*1000);
 }
 
+uintptr_t CarlaPipeServer::getPID() const noexcept
+{
+#ifndef CARLA_OS_WIN
+    return pData->pid;
+#else
+    return 0;
+#endif
+}
+
 // -----------------------------------------------------------------------
 
 bool CarlaPipeServer::startPipeServer(const char* const filename, const char* const arg1, const char* const arg2) noexcept
diff --git a/source/utils/CarlaPipeUtils.hpp b/source/utils/CarlaPipeUtils.hpp
index 67734b8c9..fb9ffce6f 100644
--- a/source/utils/CarlaPipeUtils.hpp
+++ b/source/utils/CarlaPipeUtils.hpp
@@ -244,6 +244,13 @@ public:
      */
     ~CarlaPipeServer() /*noexcept*/ override;
 
+    /*!
+     * Get the process ID of this pipe's matching client.
+     * Will return 0 if client is not running.
+     * @note: Unsupported on Windows
+     */
+    uintptr_t getPID() const noexcept;
+
     /*!
      * Start the pipe server using @a filename with 2 arguments.
      * @see fail()