This is an inbuilt function function provided by PPWIZARD.
This function is used to save a value away using a 2 part key. If you wish you can make the first part constant. The value can be retrieved using the DataGet() function.
Note that this function has nothing to do with the #data command (or its data).
The function takes 3 parameters as follows:
Note that there is no information returned by this function.
Currently the value you save is kept between compiles, this is not the aim and will be corrected in a future release. Do not code anything that relies on this fact. If you use this routine you will need to consider if you can compile more than one source at a time.