Basic Network Practice?

I've developed an application before to be run in the main PC only.

Last year, the company required me to make a client side application where it can be put to other workstations but some processes and operations were to be disabled. So I made it.

Being a noob in network programming, I just map a drive network that points to a network drive where the database is located. The 'client' application that I made is an independent application where the 'networking' is only when it access the database from the other PC(main PC). A line 'PathToDB = "B:"' is the only 'networking' line I've added.

"B:" is the mapped drive

My questions are:

1. Do I understand and apply the concept of 'server-client side' in the said scenario?? Or unfortunately, shame on me? :(

2. If that's not the concept of 'server-client', then how can I apply the true concept, using my example.

3. Does using mapped drive in networking a good practice? Having to setup the workstations, map a drive, etc.. How can I access (use networking) the database from the server using alternative way? Perhaps Winsock?

Thank you