sentences:  In contrast to Digital Research's Multi-user DOS (successor of Concurrent DOS in the multi-user products line), which would run DOS applications in pre-emptively multitasked virtual DOS machines, the DR DOS 6.0 task switcher would freeze background applications until brought back into the foreground.While it ran on x86-machines, it was able to swap to XMS memory on 286+ machines.TASKMAX did support some Copy & Paste facility between applications.