Syntax:
EXECUTE stmt_name [USING @var_name [, @var_name] ...]

After preparing a statement, you execute it with an EXECUTE statement
that refers to the prepared statement name. If the prepared statement
contains any parameter markers, you must supply a USING clause that
lists user variables containing the values to be bound to the
parameters. Parameter values can be supplied only by user variables,
and the USING clause must name exactly as many variables as the number
of parameter markers in the statement.

You can execute a given prepared statement multiple times, passing
different variables to it or setting the variables to different values
before each execution.

URL: http://dev.mysql.com/doc/refman/5.0/en/sqlps.html

