hey
the mikrotik have sever hosting (php, asp, mysql, . . .) or need to make one external server ???
no, you need to have an external server
how is work the hotspot??
his dont have server ??? 
it uses it own very simple web server, which as far as i am aware can only server static pages, for anything fancy like mysql and such you need an external web server.
can use /system script in mikrotik same server(dynamic HTML) ???
No.
ok … thank you very much 