If you know a node's name, you can go there by typing g, the name, and <RET>. Thus, gTop<RET> would go to the node called ‘Top’ in this file. (This is equivalent to t, see Help-Int.) gGo to node<RET> would come back here.
Unlike m, g does not allow the use of abbreviations. But it does allow completion, so you can type <TAB> to complete a partial node name.
To go to a node in another file, you can include the file name in the node name by putting it at the front, in parentheses. Thus, g(dir)Top<RET> would go to the Info Directory node, which is the node ‘Top’ in the Info file dir. Likewise, g(emacs)Top<RET> (or just g(emacs)<RET>) goes to the top node of the Emacs manual.
The node name ‘*’ specifies the whole file. So you can look at all of the current file by typing g*<RET> or all of any other file with g(filename)*<RET>.