what tasks do most operating systems perform?
.allocating ram to open programs
.indexing files and folders
.managing communication between hardware and software
.modifying spreadsheets
.naming word-processing documents
.providing icons users can click on to open programs
(there is more than one answer to this )

Allocating RAM and swap as programs launch
managing communications between hardware and software

".providing icons users can click on to open programs" is questionable. It's not really an OS function but both Windows and OSX have made the GUI too integral to the OS.

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It can sometimes be called a process chart.