Problem with accessing subversion installed on unix server through windows GUI

We are using subversion as a version control system in our project. We are connecting to client`s sun Solaris box through check point VPN. Client has installed subversion .
We have created repository and add files to it. Now we want to access the same from our windows machine (through tortoise svn client). Is it possible?

Also the client team want to access the svn through GUI (From Windows using tortoise client ) in their local network. if it is possible what will be URL for the same?
Can we know in what way the subversion has been installed (plain svn serve or through apache http server).