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Useful for small clearup activities on each shutdown. As we're trying to shut down the range of things looked for is very small compared with the PreDesk directory: no sprites, no apps (or directories), no utilities, no BASIC, no modules. Keep it simple and fast!
* If Choices:Boot.PostDesk is present, any obey files within it are obey'd
* Swap false/true to {FALSE} and {TRUE}
* TaskManager_Shutdown flag bit 7 can skip the shutdown scripts
* Simplified evaluation of Boot$OSVersion
* Changed pre RISC OS 3.50 reset to actually do a reset rather than just reenter the desktop
* Shared a few constant strings

Version 1.37. Tagged as 'Switcher-1_37'