I ofcourse can see list of all suggestions. And can navigate around using up or down arrows. But the issue is with word navigation hotkey. Im looking for a key to ”complete current WORD without closing autocomplete view and proceed typing to get best completion im looking for”

I'll be full of gratitude if you can share your test sample with 2 DEXTs with me (alkensox@g mail.com)...............For the casting, I've compared pointers to 'this' of the matched DEXT service and the pointer coming into matching notification. Seems they differ in some reason

Solved the error of missed notification by calling RegisterService in the beginning of the 'Start' method, before source/queue/notification setup @Drewbadour , seems now notification is delivered. But still have problems: ........... FIRST: Services are in the different processes. IOProviderClass = IOUserResources, IOUserServerName is $(PRODUCT_BUNDLE_IDENTIFIER) for both, IOUserServerOneProcess = 1 for both. IOMatchCategory equals IOUserClass for both. ............SECOND: When notification is delivered, OSDynamicCast fails to cast service to the type of my service. Probably the most important part