can any one help me?

[eledok]

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.