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diff --git a/scheme/plt/geiser/user.ss b/scheme/plt/geiser/user.ss
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+;;; user.ss -- global bindings visible to geiser users
+
+;; Copyright (C) 2010 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Wed Mar 31, 2010 22:24
+
+#lang scheme/base
+
+(provide enter!)
+
+(require geiser/enter geiser/eval (for-syntax scheme/base))
+
+(define-syntax (enter! stx)
+  (syntax-case stx ()
+    [(enter! mod)
+     (if (or (not (syntax-e #'mod))
+             (module-path? (syntax->datum #'mod)))
+         #'(do-enter! 'mod)
+         (raise-syntax-error
+          #f
+          "not a valid module path, and not #f"
+          stx
+          #'mod))]
+    [_ (raise-syntax-error
+        #f
+        "bad syntax; should be `(enter! <module-path-or-#f>)'"
+        stx)]))
+
+(define orig-namespace (current-namespace))
+
+(define (do-enter! mod)
+  (if mod
+      (begin
+        (enter-module mod)
+        (let ([ns (module->namespace mod)])
+          (current-namespace ns)
+          (namespace-require 'geiser/user)))
+      (current-namespace orig-namespace)))
+
+
+(define orig-loader (current-load/use-compiled))
+
+(define (init)
+  (compile-enforce-module-constants #f)
+  (current-load/use-compiled (module-loader orig-loader))
+  (current-prompt-read (compose (make-repl-reader (current-prompt-read))
+                                current-namespace)))
+
+(init)
+
+;;; user.ss ends here
+