How to add a link in powerpoint to works on any computer

Assume that you want to add a link, which opens a file during your presentation. If you add it using the following method..

you can't copy it to you usb storage device and make it work on any other computer ... because it causes in changing the path of the link.

so if you want to make it  work on another computer
1. you should create a folder and copy both presentation and the link file (which should be opened)..
2. assume that  the file is "abs.doc" add the following lines in-front of your link address
3.  ../your created folder name/abs.doc