When accessing through dial up or broadband my computer gets a specific Internet Protocol (IP) address.
Can anyone use this IP to access the service on your system, such as a webpage hosted on your Personal Computer (PC) using a port?
Can dial up IP address be used?
Yes that can be used for only a very short time interval. The address keeps on changing. The address can be known for the remote server. Set up the remote server like a host and then use sharing privileges to any one who uses it to read and execute.
The people in other systems when get to the IP shall be able to get your server and as such get the data from the server as a client.
You need to see occasionally that the IP is not changed . To get such an IP that remains static, you shall have to buy the IP address from the providers.