In my IIS webserver logfiles every now and then I find a entry with status 404 (not found) I cannot explain:
2011-07-06 17:05:48 W3SVC1804222802 10.248.3.8
GET /appl/localscripts/ifacobjcatFrame - 80 - 123.123.123.123
HTTP/1.0 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.1;+Trident/4.0;+
.NET+CLR+2.0.50727;+.NET+CLR+3.0.04506.30;+.NET+CLR+3.0.04506.648;+.NET+
CLR+3.5.21022;+MS-RTC+EA+2;+MS-RTC+LM+8) www.example.com ...