Need help about professional tax.

[zurpk]

Assalam-o-Alaykum dear members

I hope that every one will be find. Any one would like to tell me about the professional tax? I want to study and get some information about professional tax. So I shall be thankful if any one provides me some web sites where I can find materials about professional tax.
Is this kind of tax applicable in the capital territory of Pakistan? I shall appreciate your responses in this regards.

Thank you.

Zia ur Rahman