问题：

[多选] Which two installations must be completed to allow third-party software to interact with the Cisco Unified CallManager Express system through TAPI Lite?（）

A . the files in the Cisco IOS TSP file on all Windows PCs on the LAN 
B . both the Cisco IOS TSP and TAPI Lite files on all Windows PCs on the LAN 
C . the Cisco TAPI Lite files on the same Windows PC where the software is installed 
D . the files in the Cisco IOS TSP file on the same Windows PC where the software is installed 
E . the Cisco IOS TSP on the same Windows PC where the software is installed and on all remote teleworker PC