can anybody please tell me what does the "key" sign mean in project tree keil u vision.
Ok I figured it out. "key" thing means that these files are read-only file. if you want to edit them, right click on file, goto properties and uncheck the read-only box.
The icons are listed here:
http://www.keil.com/support/man/docs/uv4/uv4_ca_filegrp_att.htm
Yes, you can verify your own answer!
But the answer has already been given - twice!