Everything Old is New Again
In 1984 the new kid on the block was Borland's Sidekick. A terminate and stay resident (TSR) program for MS-DOS, it would run in the background, and when it detected the two shift keys being pressed it would overlay the (then character) screen with a calculator, a notepad, a calendar, a dialer or an ASCII table.
In 2005 one of the shiny new cool features of Apple's Mac OS X is the Dashboard. This will overlay the (now bitmapped) screen with a calculator, sticky notes, a calendar, a phone book, the weather report, and hundreds of other widgets. How things have changed...
Interestingly, on my system the virtual memory size of my dashboard's seven processes is 48,644MB and the resident set size (the actual amount of physical memory occupied) is 27,364MB. The memory occupied by Sidekick 2.0 is 40,400 bytes, three orders of mgagnitude less than dashboard. Here are the details.
655360 bytes total conventional memory 655360 bytes available to MS-DOS 588112 largest executable program sizeAfter loading:
655360 bytes total conventional memory 655360 bytes available to MS-DOS 547712 largest executable program size
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND dds 207 0.0 3.0 111268 7892 ?? S 8:30AM 0:00.69 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb dds 208 0.0 2.9 103144 7692 ?? S 8:30AM 0:01.57 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb dds 209 0.0 2.4 100624 6208 ?? S 8:30AM 0:09.61 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb dds 210 0.0 2.0 83412 5316 ?? S 8:30AM 0:00.43 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb dds 211 0.0 2.5 101980 6436 ?? S 8:30AM 0:00.56 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb dds 212 0.0 2.3 101856 5940 ?? S 8:31AM 0:00.52 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb dds 214 0.0 3.3 111776 8712 ?? S 8:31AM 0:01.41 /System/Library/CoreServices/Dock.app/Contents/Resources/Dashb