Add an unbound text box to your form (as an example, I'm naming it txtServer) then add this to the On Load event of the form.

txtServer = MyServer

Since Constants cannot be changed I would also lock the text box.

Yes but txtServer =  MyServer  & "\Docs\Document"   Does not work

What doesn't work?
Are you getting an error?

'Does not work' doesn't tell us anything.

Is this in a public module or a form module?

Nevermind... I just re-read your question. What you're trying to do won't work. You can't use a VBA variable or constant in the default value property of a field. You can do it in code, but not directly. I'd recommend using a TempVars value. This would actually make a good tip video. Give me an hour.

Here you go: Variable Default

This video is Great. I love the TempVars solution. Thank you very much.

Richard maybe a TempVars video has come to it's time?
Advocating on behalf of Adam (as well as myself and others)

Yeah, I'm using TempVars a lot in my current database for user logons. Before it was always a Public variable in a module which is how I started this database until any errors generated cleared the variables and I had to go through the login process each time. Not a problem now I've switched to TempVars.

Yes.  I second (or third) the motion for the video about TempVars.  Great Work!!!

Did somebody say TempVars?

I can't hear you... Please say it Louder...

I'm throwing a little TempVars action in the Calculator video coming up...