Thanks everyone for their replies.
After playing around with this I managed to find a reasonably elegant way of targeting the particular "ABAUS" process that I wanted when there are multiple instances of it. The trick is to set the search criteria for "ABACUS" in the NameMapping -> Mapped Objects section to contain the Index of the process and make that dependent on a project variable, say, AbacusIndex.
When it came to the actual testing I then could change the AbacusIndex value and then call RefreshMapping() function to update the search criteria for ABACUS at run time. This allowed me to direct keywordtest actions, which were written for a single instance of "ABACUS", at different instances of "ABACUS very easily.
