Why cant you submit shares to 2 or more pools simultaneously?

[theblazehen]

Eg. Tell cgminer that when it finds a share, to submit it to more than one pool?

Basically merged mining on different pools

[Graet]

the work sent by pools has info unique to the pool, shares from other pools will be rejected, only the pool that sent the work will see it as valid

[alexuk]

the work sent by pools has info unique to the pool, shares from other pools will be rejected, only the pool that sent the work will see it as valid

What is that unique data? some sort of public / private key exchange (checking system server side?)

Any docs / links on that?

[crazyates]

What is that unique data? some sort of public / private key exchange (checking system server side?)

Any docs / links on that?

Start by reading THIS. Google whatever you don't understand, and eventually it will make some sense.