One of the more frustrating experiences when using a computer is when you want to delete or rename a file or folder in Windows, but get an error stating that it is open, shared, in use, or locked by a program currently using it.
Anyone who is in the security arena should know about Windows Alternate Data Streams, otherwise known as ADS. Though not highly publicized, lack of this little known attribute of the Windows NTFS file system may affect how you solve a problem in the future.