Abstract: A electronic mail system allows a user to associate a postscript message to a conventional electronic mail message. The postscript message is only transmitted to a recipient identified in an electronic mail message's BCC field. The electronic mail system can allow multiple BCC recipients, each receiving the same, or different, blind-postscript message.

Abstract: A computer system includes an error detection and correction system for detecting and correcting single-bit errors, two-adjacent-bit errors, and four-adjacent-bit errors. Two identical error detection and correction (EDC) circuits are connected to the system memory array, and each EDC circuit is connected to half of the data bits in alternating pairs. Each EDC circuit detects single-bit errors and two-adjacent-bit errors. The EDC circuits are connected to alternating pairs of data bits so that errors of up to four adjacent bits are actually detected and corrected, two bits by the first EDC circuit and two bits by the second. Thus, if one of the x4 DRAMs in a memory array fails, each erroneous data bit from the DRAM is corrected to its original value, and the failure of the DRAM is registered.