>somebody can tell me how can i tracea program debug errors
>put interruption point or simmilar inthe ssyem i can not use
>the debugger as good as i want

Somewhere in your start routine put

Set asserts on

and where you want to check something

assert {your condition here}

If your condition is true, the code will go on. If it's false, you'll get a dialog where you can start the debugger from that point. The code is suspended on the Assert command, and you can look around your objects, variables etc and see what's going on and how did it happen that your expression got the wrong value.

Some tips: you can keep a number of expressions in the Watch window. My usual set is
_tally
alias()
recno()
reccount()
this
set("datasession")

Helps me a lot to pinpoint a problem fast.