Step 1
The sas processor has finished any previous step and begins a new step. The statement that begins the step is a DATA statement, so the compiler begins by setting up some things in RAM and on disk.
The data step compiles the DATA statement. It says, "I'm going to build a file called `pointer'."

DATA POINTER;  
   INPUT @1  ID       3.  
         @5  GENDER  $1.  
         @7  AGE      2.  
         @10 HEIGHT   2.  
         @13 DOB      MMDDYY6.;  
FORMAT DOB MMDDYY8.;  
DATALINES;

Results
The Program Data Vector (PDV):

variable	characteristics
_N_	numeric
_ERROR_	numeric

On disk:
Open the file pointer.ssd01 in the default directory.