@RANDOM[min, max]: Returns a pseudo random integer value between min and max, inclusive. The random number generator is initialized from the system clock the first time it is used after TCC-RT starts and will therefore produce a different sequence of numbers each time you use it. The maximum range between min and max is a signed 64-bit integer.
Examples:
echo %@random[0,1]
0
echo %@random[-10,10]
7
echo %@random[-10,10]
9
echo %@random[-10,10]
-6