Server side application

Hi guys,

I’m try to make an application, with I could change de value of a variable on a text file. The thing is, at this moment I have to modify the text file variables and then upload this last again and again.

The file with variables could be a XML file too.

I was thinking make something like a guestbook, the problem is, it would create new variables and I want to modify the existing ones.

I really don’t know how to begin with this.

Thx for your help.