This will free up space on your hard drive, and should cut down on the number of times your computer freezes up. Back to Top Illegal Operations Illegal Operations are error messages which pop up on your screen, just before the computer exits the program in which you were working. Usually, illegal operations are caused by mathematical errors in the program. If you receive many illegal operations while running the same program, you should reinstall that program. Unfortunately, when an illegal operation occurs, you will lose all unsaved information in the program which was shut down.
Zip files contain one or more files.
Zip files make it easy to group files. Transporting and copying zipped files is faster. Zip files save time and space, and make downloading software and transferring email attachments faster. In WebCT it is often necessary to send or upload a group of related files. Rather than distributing or uploading individual files, it is often easier to compress or zip the files.