There are 2 ways to it both with their cons! The first is setting or defining the Listen command in httpd file from ....\server\apache\conf using word pad i.e. type
Listen 192.168.1.25:80. the cons are u will not be able to access the page again while others who call on the addr will be able to if they keep changing the localhost addr to your ip addr in the string of addr in their addr bar e.g http://127.0.0.1/admin/settings.php?section=ajax to http://192.168.1.25/admin/settings.php?section=ajax after every request.
The better way is doing the installation from the scratch!! This is done by specifying your IP addr as the web addr changing the default 127.0.0.1 in the 2nd or 3rd page . The cons are moving the contents of the previous moodle site to the new one and inability to access ur site wen ur Ip addr is nt up say nt cncted. In brief u must be able to ping ur IP addr to view ur site locally. A way around that i to install VMware so that it keeps ur virtual ethernet port up while u work off network
I hope this will help a lot,
Best of luck