abnormal rename status

1. abnormal rename state
a. click on the command prompt(enter rename state)
b. double click the icon to launch command prompt
c. u can never exit rename state.
and something serious in this state
try F2 enter the state of renaming my computer
click anywhere else to exit that state, vmware shut it down.

and also when u do this operation in a normal status, the screen is not cleaned. there would be a dashed block around the text.

2. key buffer error
a. dir a directory
b. during the execution of dir, press as many as possible ctrl+c
c. next command would do nothing, like dir again or cd