Michael S: It can be frustrating for agents, but he understands why writers want to do it. But by all means say so.
Alyssa: We definitely need to know if it's a multiple submission.
Micheal: He hates hearing from someone whose work he's reading that they are going with someone else. He encourages writers to talk to agents to make sure they're a good fit before you agree to work with them.
Edward: No problem with multiple subs with full disclosure. It's heartbreak when you don't know and hear someone got representation elsewhere. He hates when a client has sent his or her manuscript to every editor in town before he gets to it.
The rule: full disclosure with your agent. Always be above board when you approach agents.