with out synchronizer

[prithviraj]

when two tasks are accessing same analog channel how to give acces , with out using synchronizer .

[DianeS]

If you are using NI's DAQmx, you can't have two tasks accessing the same hardware channel simultaneously.  You'll get a "resources reserved" error.  You would need to close one task before creating the other, which makes no sense at all.

What, exactly, are you trying to do?