Solution:

1) In fact the Windows 95/98 operating system is a non-preemptive multitasking system. And Windows NT operating system is a preemptive multitasking system. But the DDE Server will consume the system resource seriously. So even the time unit for system refresh interval of InTouch is milli-second, the performance of MMI system is unexpectable. 2) The sampling rate of the ADAM-4000 units is 10Hz, but there're no firmly report about system interval by InTouch Corcoration. Thus far, it's hard to say that if the DDE Server meet the sampling rate of ADAM. 3) The approximate numbers of individual ADAM units that can be use with the DDE Server is under 3000 links. (with Version 5.6 of Intouch)