There is a new version of Win4K3Suite available, version 2.022. This release adds the ability to automatically close applications launched with the third party software interface.
Win4K3Suite is a full featured control program for the K3/S, KX3 and KX2. It has a built in Panadapter that works with LPPAN and a sound card, as well as the SDRPlay RSP's. It supports the KAT500, KPA500/1500 and the KXPA100 on most of the above radios.
A unique feature is that is has 6 built in Virtual Radios, each of which works just like an Elecraft radio. This allows sharing of a single COM port with up to 6 applications. It also has a built in HRDLogbook server and the EiBi Shortwave database.
You see more information here: https://www.youtube.com/results?search_query=win4k3suite
and download a fully functional 30 day trial at va2fsq.com