SAP WebDispatcher start method

Hi,

Would like to know to start the SAP WebDispatcher is it have 2 method?

1) startsap

2) sapwebdisp pf=<profile>

Problem now is, earlier I'm using startsap and stopsap to start WD instance. It working fine, but then I run sapwebdisp command. I kill the sapwebdisp process, but now I can't use startsap. Whenever I run the command it will like normal start the instance and said it started. But when I check, it is not started.

Now I'm using sapwebdisp to start the instance. But I need to use the startsap method.

Would like to know is it because there are 2 method of starting the instance, and is because I use command sapwebdisp therefore it switch the starting mode?

Or any reason in behind and how can I fix it.

Thanks.