enter text into a hud (hud form?)

Is it possible to under text into a hud. In otherwords if there any sort of form field functionality or could a hud cause the wearer to only talk in a certain channel?

what you are looking for is llDialog.

Not quite. It looks like llDialog only gives you a fixed set of options. I was hoping this hud would either allow a user to type text into a field and have it heard on a specific channel or force all of the wearers chat into that channel as opposed to channel 0.

I was thinking it would work like a group intercom system. Talking into a channel for privacy. Any example of use would be in a sports game team chat. Without typeing /3 or something before each line.

swap calling cards, and use a conference IM - coz there is no way within the UI to force chat to be on a different channel

HUDs are just prims with optional llSetText info. There is no way to put cursors and input fields into them.

You can, as you surmised, use a channel with the chat bar to enter data. For example, you click on the HUD prim for one of the data points, then type something like "/9 data", and the "data" part can be placed into the "selected" (IE, the last "touched" data field.