Let $f(x,\ y)=\frac{x+y}{(x^2+1)(y^2+1)}.$

(1) Find the maximum value of $f(x,\ y)$ for $0\leq x\leq 1,\ 0\leq y\leq 1.$

(2)  Find the maximum value of $f(x,\ y),\ \forall{x,\ y}\in{\mathbb{R}}.$
1. **Transforming the function using trigonometric identities:**

   Let \( x = \tan \theta \) and \( y = \tan \phi \). Then, we have:
   \[
   f(x, y) = \frac{x + y}{(x^2 + 1)(y^2 + 1)} = \frac{\tan \theta + \tan \phi}{\sec^2 \theta \sec^2 \phi}
   \]
   Using the trigonometric identities \(\sec^2 \theta = 1 + \tan^2 \theta\) and \(\sec^2 \phi = 1 + \tan^2 \phi\), we get:
   \[
   f(x, y) = \frac{\tan \theta + \tan \phi}{(1 + \tan^2 \theta)(1 + \tan^2 \phi)} = \cos \theta \cos \phi (\sin \theta \cos \phi + \sin \phi \cos \theta)
   \]
   Simplifying further using the angle addition formula for sine:
   \[
   f(x, y) = \cos \theta \cos \phi \sin(\theta + \phi)
   \]

2. **Finding the maximum value for \(0 \leq x \leq 1\) and \(0 \leq y \leq 1\):**

   For \(0 \leq x \leq 1\) and \(0 \leq y \leq 1\), we need to evaluate \(f(x, y)\) at the boundary points and critical points within the region. 

   - At \(x = 0\) or \(y = 0\):
     \[
     f(0, y) = \frac{0 + y}{(0^2 + 1)(y^2 + 1)} = \frac{y}{1 \cdot (y^2 + 1)} = \frac{y}{y^2 + 1}
     \]
     \[
     f(x, 0) = \frac{x + 0}{(x^2 + 1)(0^2 + 1)} = \frac{x}{x^2 + 1}
     \]
     Both functions \(\frac{y}{y^2 + 1}\) and \(\frac{x}{x^2 + 1}\) are maximized at \(y = 1\) and \(x = 1\) respectively, giving:
     \[
     f(0, 1) = \frac{1}{1^2 + 1} = \frac{1}{2}, \quad f(1, 0) = \frac{1}{1^2 + 1} = \frac{1}{2}
     \]

   - At \(x = 1\) and \(y = 1\):
     \[
     f(1, 1) = \frac{1 + 1}{(1^2 + 1)(1^2 + 1)} = \frac{2}{2 \cdot 2} = \frac{1}{2}
     \]

   Therefore, the maximum value of \(f(x, y)\) for \(0 \leq x \leq 1\) and \(0 \leq y \leq 1\) is \(\frac{1}{2}\).

3. **Finding the maximum value for all \(x, y \in \mathbb{R}\):**

   We need to maximize:
   \[
   f(x, y) = \cos \theta \cos \phi \sin(\theta + \phi)
   \]
   Using the AM-GM inequality:
   \[
   \cos \theta \cos \phi \sin(\theta + \phi) \leq \left(\frac{\cos \theta + \cos \phi + \sin(\theta + \phi)}{3}\right)^3
   \]
   Let \(P = \cos \theta + \cos \phi + \sin(\theta + \phi)\). Then:
   \[
   P = 2 \cos\left(\frac{\theta + \phi}{2}\right) \left[\cos\left(\frac{\theta - \phi}{2}\right) + \sin\left(\frac{\theta + \phi}{2}\right)\right] \leq 2 \cos\left(\frac{\theta + \phi}{2}\right) \left[1 + \sin\left(\frac{\theta + \phi}{2}\right)\right]
   \]
   Let \(z = \sin\left(\frac{\theta + \phi}{2}\right)\). Then:
   \[
   P^2 \leq 4(1 - z^2)(1 + z)^2 = 4(1 - z)(1 + z)^3 = 4 \cdot 27 (1 - z) \left(\frac{1 + z}{3}\right)^3 \leq \frac{4 \times 27}{4^4} \left[1 - z + 3 \cdot \frac{1 + z}{3}\right]^4 = \frac{27}{4}
   \]
   Therefore:
   \[
   P \leq \frac{3\sqrt{3}}{2}
   \]
   with equality when \(\cos \theta = \cos \phi = \sin(\theta + \phi)\) and \(\sin\left(\frac{\theta + \phi}{2}\right) = \frac{1}{2}\), i.e., when \(\theta = \phi = \frac{\pi}{6}\), giving:
   \[
   f_{\text{max}} = \left(\frac{\sqrt{3}}{2}\right)^3 = \frac{3\sqrt{3}}{8}
   \]
   attained for any real \(x, y\) when \(x = y = \frac{1}{\sqrt{3}}\).

The final answer is \( \boxed{ \frac{1}{2} } \) for \(0 \leq x \leq 1\) and \(0 \leq y \leq 1\), and \(\frac{3\sqrt{3}}{8}\) for all \(x, y \in \mathbb{R}\).