System requirements
PC running Windows 95 or greater (excluding WindowsXP).
It uses minimal memory and should be compatible with all future versions of Windows provided Microsoft maintain backward compatibility.
It does nothing more than draw on the screen so it doesn't affect the registry and there are no additional files (dlls and the like) required.

Installation and un-installation
Screensavers are executable files with a .scr extension.  There are one or two issues that they have to take into account like they have to automatically close down if a key is pressed or the mouse is moved and they really should allow significant background processing.  For the un-technical or less familiar users I will explain what to do to install and uninstall this screensaver:

By default Windows looks in the folder called Windows for screensavers.  They can also be placed in the Windows system folder I believe.  I do not run WindowsNT so your best bet would be to search for other .scr files to find where they are.  So the only thing to do on Windows 95 is to copy the file Mosaic.scr into the Windows folder.  When you want to uninstall it just delete the file or copy it off your system if you want to keep it for another rainy day.  There is nothing more to this screensaver than that.  In order to get it to run (on Windows 95 - it will be similar on later versions but I can’t give you definitive info) select Start from your system bar, select Settings/Control Panel and then select Display.  Select the Screen Saver tab on the form that pops up and select the drop down arrow in the edit box.  This lists the titles of all the screen savers that Windows finds in its folder (that’s why you have to copy it there).  You should now find one called GridCity.  Select it and set up the wait time as required, press the Apply button and its installed.

Known limitations
Can distract you from work.
The "engine" as such is based on Mosaic and thousands have been downloaded from our web site and the program has been around for many years.  It behaves very well and I know it has been installed and run on many different systems.  We have had one or two claims of bugs which have turned out to be something else on the users system.  I have had virus checkers running in the background and asynchronous port communications running successfully with this screen saver active.

ATTENTION WINDOWS XP USERS: Windows XP will not allow you to access 16-bit screen savers (which make up many screen savers available on the internet, including this one.) I am informed that you can get around this with a screen saver utility like Screen Control, which allows you to access all 16-bit and 32-bit savers.

Bugs (eek)
None

Credits
Thanks to all the users who email us with comments and suggestions.