How to replace a text with machine name

hi, I want to replace a text with the machine name. How do i write the machine name in here??

Push "localhost" #-- text to be replaced within the " "
Push "$COMPUTERNAME" #-- replace with anything within the " "
Push all #-- replace all occurrences
Push all #-- replace all occurrences
Push $EXEDIR\file.txt #-- file to replace in
Call AdvReplaceInFile #-- Call the Function

How to replace the "$COMPUTERNAME" with the machine name??

I would use a Var and not a define, so

; to access system info, include system plugin

!include "System.nsh"

; variable the computer name will be written to

Var COMPUTERNAME

Then in a section (probably .onInit Section) put this code to write the name to the variable specified above

; Read the computer name from system

System::Call "kernel32::GetComputerName(t .r0, *i ${NSIS_MAX_STRLEN})"

; Write the return to the Variable

StrCpy $0 $COMPUTERNAME

then just wherever u want it to say the computer name, have $COMPUTERNAME

hope it helps
p.s. not too sure if it works with 98, works with XP/2000

sorry the last line should be like this

StrCpy $COMPUTERNAME $0

hate backwards typing 😱

Sorry. I mean i want the local machine name to be replaced in the text.