From DH's Terms Of Services, I think you might have problem if there is any installation of chat scripts on your host plan.
"The customer agrees to make use of DreamHost Web Hosting servers primarily for the purpose of hosting a website, and associated email functions. Servers are shared with other customers, and as such IRC-related activities or severely CPU intensive CGI scripts (e.g. chat scripts, proxy scripts, scripts which have bugs causing them to not close properly after being run) are not encouraged. Any application that listens for inbound network connections (even if the application would otherwise be allowed) are not permitted. BitTorrent clients, IRC bots and bouncers (BNC) specifically may not be run on any DreamHost Web Hosting server. If your processes are adversely affecting server performance disproportionately DreamHost Web Hosting reserves the right to negotiate additional charges with the Customer and/or the discontinuation of the offending processes."
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