Can you access a local server from a mobile device or another computer? [on hold]

I'm curious to know if there is a way to access a local server such as WAMP or MAMP from another computer or mobile device securely? Say I wanted to test a website or maybe an app designed on my PC running WAMP or MAMP on another device or computer without having to post it live somewhere is there a program for that or is there a more efficient way of testing without having to go live?