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Quarterdeck was acquired by Symantec (the Norton Utilities company). Symantec doesn't support Quarterdeck products. DESQview is a graphical interface for DOS and has a following by some DOS OS users. There is a comp.msdos.DESQview group that can answer questions.
In the DOS times, Quarterdeck made the excellent QEMM memory manager for DOS, which could free a lot more conventional memory than the DOS EMM could, and provided support for extended and expanded memory.
Also, if you ran QEMM, you could run DesqView, which was a "multitasking for DOS" product. Compared to today's multitaskers, it was extremely primitive, but it worked with very little resources.
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