hi fronds,

This section describes the driver object types.
Object types

Connection object:
The objects of connection type implement database connections. Connecting to a MySQL resource, while inexpensive, requires PHP to issue a call to the mysql client API via mysql_connect(). Passed as variables to this function are the connection arguments for the database host, user, password, etc. Once the MySQL database server has received the connection information, it will either return a success value, or a failure. Upon failure, the mysql_error() function can be used to determine what went wrong during the connection attempt

Session object:
The objects of session type used to SQL statements and retrieve the SQL query results. Every session object is bound to only one connection

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Thanks,
Venkatbi...