can any one help me?
 

im writing a tool and i want this tool using by only forum's member that paid.

i mean:
there is a id and pw area on tool, users type their id and pw click login,
tool ll check id and pw, if member is paid user they can use tool. if not they cant.
and if it possible, after success login, i want to get announcement too.

if there is a way to do it, i ll buy vb.
please i need some guide.

thanks.

Yes. You can use a standard feature in vBulletin called 'Paid Subscriptions' - there are also a few modifications that would allow you to do this.

there is paid subscriptipns in vb. but i dont know how to comminicate with vb and find out who is paid who is not with my tool. (this tool is windows based program not vb modification)

If your application can contact the server and fetch the usergroups the user is in, it can check if the user is a paid subscriber.