Determine the number of times and the positions in which it appears $\frac12$ in the following sequence of fractions:
$$ \frac11, \frac21, \frac12 , \frac31 , \frac22 , \frac13 , \frac41,\frac32,\frac23,\frac14,..., \frac{1}{1992}$$
1. **Understanding the Sequence:**
   The sequence is constructed by listing fractions in a specific order. For each integer \( a \) starting from 2, the fractions are:
   \[
   \frac{a-1}{1}, \frac{a-2}{2}, \frac{a-3}{3}, \ldots, \frac{1}{a-1}
   \]
   This means for \( a = 2 \), the sequence is \( \frac{1}{1} \). For \( a = 3 \), the sequence is \( \frac{2}{1}, \frac{1}{2} \). For \( a = 4 \), the sequence is \( \frac{3}{1}, \frac{2}{2}, \frac{1}{3} \), and so on.

2. **Identifying \(\frac{1}{2}\) in the Sequence:**
   We need to find when \(\frac{1}{2}\) appears in the sequence. Notice that \(\frac{1}{2}\) appears as \(\frac{k}{2k}\) for some integer \( k \). This happens when \( a = 3k \) because:
   \[
   \frac{k}{2k} = \frac{1}{2}
   \]
   Therefore, \( a = 3k \) and \( k \in \{1, 2, 3, \ldots, 664\} \) since \( 3 \times 664 = 1992 \).

3. **Counting the Occurrences:**
   Since \( k \) ranges from 1 to 664, there are 664 occurrences of \(\frac{1}{2}\) in the sequence.

4. **Finding the Positions:**
   To find the positions of \(\frac{1}{2}\) in the sequence, we need to determine the position of \(\frac{k}{2k}\) when \( a = 3k \). For each \( a \), the number of terms before it is given by the sum of the first \( a-2 \) integers:
   \[
   \sum_{i=1}^{a-2} i = \frac{(a-2)(a-1)}{2}
   \]
   When \( a = 3k \), the number of terms before it is:
   \[
   \frac{(3k-2)(3k-1)}{2}
   \]
   The position of \(\frac{k}{2k}\) within the group for \( a = 3k \) is \( k \). Therefore, the total position in the sequence is:
   \[
   \frac{(3k-2)(3k-1)}{2} + k
   \]
   Simplifying this expression:
   \[
   \frac{(3k-2)(3k-1)}{2} + k = \frac{9k^2 - 5k + 2}{2}
   \]

The final answer is \( \boxed{664} \) and the positions are \( \boxed{\frac{9k^2-5k+2}{2}, k \in \{1, 2, 3, \cdots, 664\}} \).