How does Sybase ASE pick cores during start up ?

Hi,

I am using ASE 15.7 Enterprise Edition with 2 instances as below,

APP1_INSTANCE

APP2_INSTANCE

The server is a 16 core Solaris server and in the configuration file of first instance the parameter "max online engines" is set as 4 and in the second it is set as 1.

I have a few questions regarding this,

1) How does ASE pick the 4/1 cores to use out of 16 ?

2) Is it true that the licence for Sybase ASE is core based if so will the licence agreement get impacted if i change the core value from 4 to other value ?

3) If the licence model is not based on cores is the licence model per instance ?

Thanks in advance,

Kedar