Usually its a type of msging service. similar to nickserv it has the ability to message everyone on the entire network. it is usually part of a services package. again as ive stated its been some time since ive played with ircop or ircd's and services, work just steps in the way of playtime LoL
From being an oper on some IRCD networks many times, a Globop is where an oper has the correct user modes to be able to use all all oper commands over the entire network, ie; perhaps setting a gline to someone on another server, where as a Locop gets the usermodes on 1 server only, normally allowing him to only use the oper commands to users connected to the same server.