Forums mIRC Help How do I automate Nickserv Identify <password>?

That big a space isn't necessary, but there does have to be a bit of space, usually 2 presses of the space bar is sufficient. Also note that the spaces are needed both between the { and the .msg as well as at the end of the line before the }
Alternatively, you could just put the .msg line on a separate line.

As to network and server, sometimes they are the same, sometimes they are not.
Bigger networks will have multiple servers that people can connect to.

One network I'm on is Xeromem, thus //echo -a $network returns Xeromem
However, //echo -a $server could return any of these:
DeathStar.XeroMem.Com
Structure.XeroMem.Com
Mysfyt.Waysted-Youth.Net
Astaroth.ESyLumIRC.com
Hell.ESyLumIRC.com
Insanity.Vapors.Net

These are all servers that are connected to the Xeromem network.