Raise activation level

[kw_richards]

How do I raise my activation level.

Let's say I have
class A calls "Meth1" on class B
during this invocation class B calls back (Meth2) to class
A
class A then calls Meth4 on class B

When Meth4 is completed, Meth2 completes which results in Meth1 completing

class A then calls Meth3 on class B

I would like the call back (Meth2) to raise the activation level on class A to indicate
that there are actually 2 'sequences"
A - Meth1 -> B - Meth2-> A - Meth4 ->B
and
A - Meth3 -> B