If you start Graph'O->Mat you don't have to select 'New' in the File menu, you can just start to create a graph. More on creating a graph in section 4.3.3 on page 
.
Let's start with an existing graph. In the File menu, select 'Load', enter the full path and filename of an existing Graph'O->Mat file (e.g. ''a:
01.gom''), press enter and then 'OK'. Now you can see a quite randomly graph with some crossings. Try to move the vertices with your mouse so that you get a graph with lesser crossings. Then you can save this graph by just clicking on File - 'Save' or as we do right now as a new file by selecting 'Save as'. This opens a new dialog where you can enter a name for your graph. The last operation in the File menu is the 'Exit' command to end Graph'O->Mat. But hopefully you'll not need that by now.
Note for power users:
You can also edit graph files with your favorite editor if you have to exactly build a graph of some given coordinates, but nevertheless it is easier and much more comfortable to edit your graphs with Graph'O->Mat and on the other hand, this only works with the PC version. You can find the structure of the .gom-files in figure 8 on page .
Figure 8: The .gom-file structure (PC)
