Kevin,
The 5112 can accomplish continuous acquisition. However, due to PCI limitations and other system limitations you can not stream data from the 5112 to the PC at 100MS/s continuously.
However, if I had more information on your application then we can see if we can come up with a solution that fits your needs. For example, what are you trying to measure? Is the entire signal of interest to you or are certain anomalies important in the signal and the time in between is insignificant? If you describe your application more throughly than we can see if we can solve your measurement needs with a different approach.
Michael