====Session:Start====

This function is part of the [[Session|Session]] class.

**Start** is used to begin listening for data changes from ARDI.

You will initially get an //inrush// of data points, as when you first connect you'll be sent the current values for every point you've requested.

After that inrush has finished, you'll begin to only get partial updates containing only the channels that have changed.

**Note that this is a blocking function**. If you want to continue with other work and let this subscription run in the background, we suggest calling 'Start' in a thread.

===Parameters===

None

===Return Value===

Returns **True** if the subscription was successful. Otherwise an exception will likely occurr.

===See Also===

[[Session_Stop]]