You can use the PIACEPoint method PutValue. When this method is called, it sends the value to PI through the API. Let us know if you need to use the SDK but the PutValue method should be fine.
Dan, thanks - that worked perfectly. So, just for the benefit of any future search, my code now looks like:
.Value(Timestamp1) = some value
ACE_TestTag.Value(Timestamp2) = some other value
Steve, thanks for sharing with everyone! I should remind everyone that the PutValue method sends data to PI when the PI ACE Wizard is in debug and test mode.