The SYSLAST macro variable stores name of the last successfully created data set. So it depends on the situation of three  macro calls.
Assume that all calls are successfully executed. The return values will be WORK.HOUSES, WORK.RANCH, WORK.HOUSES after each call.

Here is an example.








1    data t1;
2      x=1;
3    run;

NOTE: The data set WORK.T1 has 1 observations and 1 variables.
NOTE: DATA statement used (Total process time):
      real time           0.27 seconds
      cpu time            0.03 seconds


4
5    %put >>>&syslast<<<;
>>>WORK.T1                              <<<

OK, I've got the meaning and usage of SYSLAST. Thanks for your explicit explanation!

学习了，谢谢。