NULL, NULL, 0, NULL, NULL

We may make fun of Microsoft's BEST ENTERPRISE SOFTWARE PRACTICES, but seriously, what were they smoking* when they came up with the NULL, NULL, NULL nonsense?

* No, not their anuses, before anyone suggests that.

bar(x)=foo(x,NULL,NULL,NULL)
call->bar(7)=foo(7,NULL,NULL,NULL)
Problem solved