http://blogs.msdn.com/b/jmstall/archive/2005/12/13/dont-rewrite-opcodes.aspxSome tools work by replacing instructions in the target app. The tool may introduce a jump to some stub that will still execute the original instructions. This may work fine in native code, but you can't safely changed arbitrary instructions in JITeden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/jmstall/archive/2005/12/13/dont-rewrite-opcodes.aspx#503506Wed, 14 Dec 2005 13:19:40 GMT91d46819-8472-40ad-a661-2c78acb4018c:503506David ElkindAgree absolutely. However, we at Identify do many tricks in order to enable our code modification-based instrumentation work flawlessly in the managed code... Sometimes we are having a hard time, though... :)<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=503506" width="1" height="1">