In a message on 01-29-95, Jon Guthrie said to Robert Mcisaac:

JG> ... OS/2 was never designed for "hard" real time. 
JG>(Here, I define "hard" real time to be anything that needs guaranteed
JG>response times under a millisecond.  

Using that definition, OS/2 supports "hard" real time if you don't mind
providing the required response in a device driver as a response to an
interrupt.  (I object to your definition of "hard" real time, but the
point is OS/2 guarantees better than 1 ms response to an interrupt.) 
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 * MR/2 * Now cruising at Warp 3!

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