Calling routines from another project

Hi, 



I went through the articles and their related items at 

http://support.smartbear.com/viewarticle/56535/



I want to know if my requirement mentioned below is possible? If so How? If Not please suggest me any work around available. 



Requirement: 

I have a script file containing few frequently used functions in a central location over a network.

Any user can add it to their project and use the 'UseUnit clause and use the functions in the script. 

I see that once the script file from the library is added onto the user's project he is able to edit it too. Is there any way this (library file) can be made a read only file if its imported? 



If  the user selects the Remove option on the imported script(from project explorer) and choses remove what are its implications on the code present in the new project? 



Kindly apologize if I have overlooked anything.