I think he is refering to the fact that you can actually input and execute trades on a Bloomberg machine.
Yes you can but you have to sign up with their services. You need to use their ECN to execute trades. Its similar to Instinet. The advantage using BB gets you is that you have all their services at your disposal.
What we did at my old shop was we had BB machines, which cost a few thousand dollars a month to lease, and used their trading system to place trades. The commissions we generated were used to pay back the cost of leasing the machines. This is called soft dollaring. It is very common on Wall Street.