In the same way how FO call in laser guided artillery by painting the target with laser designation.It is a man-in-the-loop system. How can it do co-operative engagement? .
An ultimately obsolete ATGM, adopted because the PLA was too cheap to buy the HJ-12 and similiar Top-Attack ATGMs.
It's not that China will face advanced tanks now, but once the ROCA gets M1A2s, including IR-jammers, those HJ-11 SACLOS ATGMs will not be any better than last generation's Russian ATGMs.