Okay, CSMR, I'm not sure if this will anser your question. Consider evaluating the limit of an expression x^y where x and y both tend to zero.
For example:
Lim (4x)^{3/ln(x)}
x->0+
Now, we can see that as x->0, 4x goes to zero, as well as 3/ln(x) - keep that in mind.
Now, let's simplify things and define z as z=(4x)^{3/ln(x)}. Now, since we're approaching zero from the right we can look at the ln(z) since it is 1-1 with z. We now have:
Lim [3 ln(4x)]/[ln(x)]
x->0+
This, however gives us another indeterminate form, so we apply L'Hopital's Rule to obtain 3.
Thus, our original limit, by reversing the earlier transformation is e^3.
By this example, I mean now to say that the limit of x^y as x and y approach zero is undefined since there is no one value that it evaluates to.