Thanks for the kind words 411A, the problem is that I forget more everyday, However:
Activation of DLC is fully automatic and controled by logic circuitry in the Flight Control Electronics System (FCES) computer. The FCES computer looks for the following:
1. DLC servo is pressuried
2. 2 of 3 Throttle Handles in less then full power.
3. Flap position greater than 30 degrees.
4. Stall warning not detected.
5. Go around not commanded
If the above conditions are met Spoilers 1 - 4 are activated to a new null point of +7 degrees (+9 degrees on -500's). 777AV8R's description a few posts earlier provided an excellent discription of what happens after DLC activation.
The above critera is followed in Autoland and Manual approches.