Removing a random number from a list

[Malic]

Picking a random number between 0000 and 9999.  How to make it so it removes that number from future random picks so it does not double up until it has completed what I need it to do?

[Pfeil]

You could store the number(s) that have already been picked, then check whether the newly generated number equals a stored number, and if so generate another new random number and repeat that cycle until the outcome is a number that hasn't been picked yet.