Putting [random] in your template displays a random number between 0-99. An optional format is a floating-point number between 0.0 and 1.0, with a granularity of 32768 intermediate values. [random format=float] will generate this alternate floating-point number.

Putting [lastrandom] in your template displays the same value as the last [random] number displayed. The format of the number will match whatever format was used in the previous [random] use.