diff --git a/bin/on_start.lsp b/bin/on_start.lsp
new file mode 100644
index 0000000..9c1263a
--- /dev/null
+++ b/bin/on_start.lsp
@@ -0,0 +1,120 @@
+;; ============================================================
+;; on_start.lsp - SSG_LIB Startup fuer BricsCAD
+;; Wird beim Start von BricsCAD automatisch ausgefuehrt
+;; ============================================================
+
+(defun ssg-lib-safe-load (datei / result)
+  (setq result (vl-catch-all-apply 'load (list datei)))
+  (if (vl-catch-all-error-p result)
+    (progn
+      (princ (strcat "\n[SSG_LIB] FEHLER beim Laden von " datei ":"))
+      (princ (strcat "\n  " (vl-catch-all-error-message result)))
+      nil
+    )
+    t
+  )
+)
+
+;; ------------------------------------------------------------
+;; SSG-DBG-FN - Prueft ob ein AutoLISP-Symbol gebunden ist
+;; Gibt "JA" oder "NEIN" zurueck (atoms-family, BRX-Cmds nicht pruefbar)
+;; ------------------------------------------------------------
+(defun ssg-dbg-fn (fname)
+  (if (car (atoms-family 1 (list fname))) "JA" "NEIN")
+)
+
+;; ------------------------------------------------------------
+;; SSG-LIB-REGISTER-CHECK - Verfuegbarkeit aller Befehle ins Debug-Log schreiben
+;; ------------------------------------------------------------
+(defun ssg-lib-register-check ()
+  (dbgmsg "[CHECK] --- AutoLISP Funktionen (atoms-family) ---")
+  (dbgmsg (strcat "ssg-start:            " (ssg-dbg-fn "SSG-START")))
+  (dbgmsg (strcat "ssg-end:              " (ssg-dbg-fn "SSG-END")))
+  (dbgmsg (strcat "ssg-make-layer:       " (ssg-dbg-fn "SSG-MAKE-LAYER")))
+  (dbgmsg (strcat "ssg-errhan:           " (ssg-dbg-fn "SSG-ERRHAN")))
+  (dbgmsg (strcat "ensure-block-loaded:  " (ssg-dbg-fn "ENSURE-BLOCK-LOADED")))
+  (dbgmsg "[CHECK] --- SSG_LIB_Commands (c:...) ---")
+  (dbgmsg (strcat "c:ILS_BTMT_Beladung:  " (ssg-dbg-fn "C:ILS_BTMT_BELADUNG")))
+  (dbgmsg (strcat "c:ILS_K90LA:          " (ssg-dbg-fn "C:ILS_K90LA")))
+  (dbgmsg (strcat "c:ILS_TEF_Strecke:    " (ssg-dbg-fn "C:ILS_TEF_STRECKE")))
+  (dbgmsg (strcat "c:KreiselInsert:      " (ssg-dbg-fn "C:KREISELINSERT")))
+  (dbgmsg (strcat "c:KreiselEdit:        " (ssg-dbg-fn "C:KREISELEDIT")))
+  (dbgmsg (strcat "c:ILS_Eckrad:         " (ssg-dbg-fn "C:ILS_ECKRAD")))
+  (dbgmsg (strcat "c:OMNI_AP60:          " (ssg-dbg-fn "C:OMNI_AP60")))
+  (dbgmsg (strcat "c:OMNI_APB_630_90:    " (ssg-dbg-fn "C:OMNI_APB_630_90")))
+  (dbgmsg (strcat "c:OMNI_W90_Einfach:   " (ssg-dbg-fn "C:OMNI_W90_EINFACH")))
+  (dbgflush)
+)
+
+(defun ssg-lib-startup ( / lisp-pfad menu-pfad curr-srch menu-datei lsp-fb-pfad)
+
+  ;; Pfade aus Umgebungsvariablen lesen
+  (setq lisp-pfad (getenv "DXFM_LISP"))
+  (setq menu-pfad (getenv "DXFMAKRO"))
+
+  ;; Pfadtrenner vereinheitlichen: Backslash -> Forward-Slash
+  (if lisp-pfad  (setq lisp-pfad  (vl-string-translate "\\" "/" lisp-pfad)))
+  (if menu-pfad  (setq menu-pfad  (vl-string-translate "\\" "/" menu-pfad)))
+
+  (if (null lisp-pfad)
+    (progn
+      (princ "\n[SSG_LIB] FEHLER: DXFM_LISP nicht gesetzt!")
+      (princ "\n[SSG_LIB] Bitte zuerst bin\\setenv.bat ausfuehren.")
+    )
+    (progn
+      ;; Debug-Logging so frueh wie moeglich starten
+      (if (findfile (strcat lisp-pfad "/ssg_dbg.lsp"))
+        (progn
+          (load (strcat lisp-pfad "/ssg_dbg.lsp"))
+          (dbgopen "debugfile.dbg" "DXFM_LOG")
+          (dbgmsg "[on_start] Startup begonnen")
+          (dbgmsg (strcat "[on_start] DXFM_LISP=" lisp-pfad))
+          (dbgmsg (strcat "[on_start] DXFMAKRO=" (if menu-pfad menu-pfad "nicht gesetzt")))
+          (dbgflush)
+        )
+      )
+
+      (princ "\n[SSG_LIB] Lade SSG_LIB Umgebung...")
+
+      ;; Library laden (direkt, damit Fehler sichtbar sind)
+      ;; Kein SRCHPATH-Aendern noetig - alle Dateien werden ueber
+      ;; absolute Pfade (Umgebungsvariablen) geladen
+      (if (findfile (strcat lisp-pfad "/ssg_load.lsp"))
+        (progn
+          (load (strcat lisp-pfad "/ssg_load.lsp"))
+          (princ "\n[SSG_LIB] ssg_load.lsp geladen.")
+        )
+        (princ "\n[SSG_LIB] WARNUNG: ssg_load.lsp nicht gefunden!")
+      )
+
+      ;; Menue laden
+      (if menu-pfad
+        (progn
+          (setq menu-datei (strcat menu-pfad "/menu/SSG_LIB.mnu"))
+          (if (findfile menu-datei)
+            (progn
+              (command "_.MENULOAD" menu-datei)
+              (menucmd "P13=+SSG_LIB.POP1")
+              (princ "\n[SSG_LIB] Menue SSG_LIB geladen und eingebunden.")
+            )
+            (princ (strcat "\n[SSG_LIB] WARNUNG: " menu-datei " nicht gefunden!"))
+          )
+        )
+        (princ "\n[SSG_LIB] WARNUNG: DXFMAKRO nicht gesetzt, Menue nicht geladen!")
+      )
+
+      ;; DBLCLKEDIT=1: Doppelklick aktiv, ***DOUBLECLICK-Eintraege steuern Block-Verhalten
+      (setvar "DBLCLKEDIT" 1)
+
+      (dbgflush)
+
+      (ssg-lib-register-check)
+
+      (princ "\n[SSG_LIB] Startup abgeschlossen.")
+    )
+  )
+  (princ)
+)
+
+;; Startup ausfuehren
+(ssg-lib-startup)