It is possible to generate random numbers in a TeX document. For a gimmick i wanted a random line from a text file in my slides. The first step was to find a random number.
A random number generator is provided by the package "lcg". The generator can be initialized with a given positive value. The same positive seed results in the same random numbers. A seed of -1 initializes the generator with a more or less random value, based on the current time.
\reinitrand[first=1, last=#1, counter=FileRandom, seed=-1, quiet=y]
Random number: \NewRandom
In addition it needs a counter to store the random value ("SavedRandom" in my example) and a command to to "export" the random number ("NewRandom" in the example) into the text.
The function which actually initializes the random generator accepts two parameters: the highest possible random number (the min value is set to 1 in my example) and the command to store the generated random number ("NewRandom"). The number is exported as arabian number, it's also possible to use roman numerals:
or alphabetic characters: