it's a vscripts mod. so, can't be used together with mods that alternate gameplay directly(such as Admin System) but works fine with Weapon Script mods since i didn't use weapon script files Works only on Local Host and Singleplay. Does...

VSLib Developer Guide - Installation
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Left 4 Dead 2 Guide
A simple, powerful VScript library for L4D2. This library will make your modding so much easier. Create superior mutations, interactive maps, and much more.
Installing
Download the library and just extract the contents to the following folder: C:\Program Files (x86)\Steam\SteamApps\common\Left 4 Dead 2\left4dead2\scripts\vscripts That's it. Double check that your vscripts folder has a VSLib folder inside. When you distribute your map, mutation, or mod, make sure that you package the VSLib folder with your scripts. The end user / gamer does not need to download or install anything-- everything will be in the VPK. Next, read about some helpful addons that you can use while working with VSLib.
Documentation
For API documentation (e.g. Doxygen), see here: http://l4d2scripters.github.io/vslib/docs/
Examples of plugins using VSLib
The following are some mods that use VSLib. You can download these mods and view their source code for examples. Stranded: Intense survival experience. http://www.gamemaps.com/details/10253 Rayman1103's Admin System: Epic admin system mod. http://www.gamemaps.com/details/9406 Shotgunefx's Path Recorder: A really nice helper utility to record camera and vehicle paths. http://www.gamemaps.com/details/15514 Boomer Peril: Tank Rush with a twist. http://www.gamemaps.com/details/15515 Vicious Infected: Inspired by the SM plugin, this plugin takes infected to new heights. http://www.gamemaps.com/details/15516