I am looking for a way for two people to have instant communication over the internet without installing any software. MSN2Go or something similar would be ideal but unfortunately we are prohibited from using IM by our sysadmin.
A solution to this problem would be an inhouse web-based IM/chat type thing. It doesn't need to be particularly complex as only two people would be communicating at any time: one of the people will always be on site as host, the other will be a remote user who may want to ask the host questions.
Don't know how well I explained that but basically, I'm not sure where to start and was wondering if anyone could point me in the right direction please.

There are tonnes of web based solutions if you want to chat to your friends without your boss knowing (although they will still be able to see what sites you are going to). A Google search for "web based chat" will bring up plenty.

If you want to find a more private place to chat, you're probably going to have to create/download and run one yourself. This can be down using scripting/programming langagues such as Java, C#, PHP, ASP and so on. Typing the name of a programming language followed by "chat" in Google will probably do the trick.

What I did when I was in college was to write a small Java chat program. One person runs it as a server, the others connect to that server and then they can chat away.

I am looking for a way for two people to have instant communication over the internet without installing any software. MSN2Go or something similar would be ideal but unfortunately we are prohibited from using IM by our sysadmin.
A solution to this problem would be an inhouse web-based IM/chat type thing. It doesn't need to be particularly complex as only two people would be communicating at any time: one of the people will always be on site as host, the other will be a remote user who may want to ask the host questions.
Don't know how well I explained that but basically, I'm not sure where to start and was wondering if anyone could point me in the right direction please.

If you want a corporate, closed IM system, you might check out Lotus' Sametime. Also AOL has a corporate solution. Another possibility is using NetMeeting which comes free with Windows.