[Environment]
Include = C:\flatasm\INCLUDE\    

1.1.1 System requirements
All versions require the x86 architecture 32–bit processor (at least 80386),
although they can produce programs for the x86 architecture 16–bit processors,
too. Windows console version requires any Win32 operating system,
while Windows GUI version requires the Win32 GUI system version 4.0 or
higher, so it should run on all systems compatible with Windows 95.

The example source provided with this version require you have environment
variable INCLUDE set to the path of the include directory, which is the
part of flat assembler package. If such variable already exists in your system
and contains paths used by some other program, it’s enough to add the new
path to it (the different paths should be separated with semicolons). If you
don’t want to define such variable in the system, or don’t know how to do it,
you can set it for the flat assembler IDE only by editing the fasmw.ini file
in its directory (this file is created by fasmw.exe when it’s executed, but you
can also create it by yourself). In this case you should add the Include value
into the Environment section. For example, when you have unpacked the
flat assembler files into the c:\fasmw directory, you should put the following
two lines into your c:\fasmw\fasmw.ini file:
[Environment]
Include = c:\fasmw\include
If you don’t define the INCLUDE environment variable properly, you will have
to manually provide the full path to the Win32 includes in every program
you want to compile.

where can I find more information about this tags?