diff --git a/server.py b/server.py
index 4d35586..67079fc 100644
--- a/server.py
+++ b/server.py
@@ -114,6 +114,9 @@ class KeyboardHandler:
     def printstring(self, s):
         last_c = ''
         last_last_c = ''
+        # send Tab-key, to indicate this is sent by machine, not by human
+        self.write_report(NULL_CHAR * 2 + chr(0x2b) + NULL_CHAR*5)
+        self.release_keys()
         for c in s:
             if last_last_c == '§':
                 self.change_color(last_c, c)