These do such things as support various options, allow you to bail out of a command that you do not want to execute, and offer on-line help. All three of these commands exit the user from xspread.
G are the bail out commands.
This will bring up an index to on-line help. The index will display a list of topics together with the letter that allows you to select a particular topic. The help facility is NOT context sensitive. TAB Point Command. When the character cursor is on the top line, you can use TAB to define a range by pointing, instead of by specifying cell addresses.