thanks ddmitrie it worked now with these settings at the end of my php.ini
[Zend]
zend_extension_ts="c:\programme\apachefriends\xampp\php\ext\php_dbg.dll"
;zend_optimizer.enable_loader = 0
zend_optimizer.optimization_level=1023
;zend_extension="c:\programme\apachefriends\xampp\php\zendOptimizer\lib\Optimizer-2.5.2\php-4.3.x\ZendOptimizer.dll"
zend_extension_ts="c:\programme\apachefriends\xampp\php\zendOptimizer\lib\ZendExtensionManager.dll"
zend_extension_manager.optimizer_ts="c:\programme\apachefriends\xampp\php\zendOptimizer\lib\Optimizer-2.5.2"
;zend_optimizer.license_path="c:\programme\apachefriends\xampp\licenses\zendOptimizer\license.txt"
[debugger]
debugger.enabled = true
debugger.profiler_enabled = true
debugger.JIT_host = clienthost
debugger.JIT_port = 7869
phpinfo saying:
 	| Quote: | 
	| This program makes use of the Zend Scripting Language Engine:
 Zend Engine v2.0.0, Copyright (c) 1998-2004 Zend Technologies
 with DBG v2.11.30, (C) 2000,2004, by Dmitri Dmitrienko
 with Zend Extension Manager v1.0.2, Copyright (c) 2003-2004, by Zend Technologies
 with Zend Optimizer v2.5.2, Copyright (c) 1998-2004, by Zend Technologies
 
 | 
 	| Quote: | 
	| run <? phpinfo(); ?> script just to make sure dbg extension is working properly. You will see following message in the header:
 
 with DBG v2.11.30, (C) 2000,2004 by Dmitri Dmitrienko, http://www.php-debugger.com
 
 and appropriately formed dbg section.
 
 | 
but there is no dbg section in the phpinfo. Why?
Whats the difference between "php-"extionsion and "zend-"extension? And why doesnt the extension work with the php one?
thanks again