Based on USBKeyboardMouse example. I added USB String Descriptor so mbed reports itself to host not only with VID & PID but also with name of manufacturer, product name, serial number, configuration number and interface name. These can be changed to matching Yours in USBhid.cpp file on lines 88 - 122.

Dependencies:   mbed

Revision:
0:f97b1f255167
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Sep 08 15:01:33 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0