Here are the Merge commands for Fast mode; in Edit mode, precede them with C-c C-c:
Select the previous difference.
Select the next difference.
Choose the A version of this difference.
Choose the B version of this difference.
Select difference number n.
Select the difference containing point.
Quit—finish the merge.
Abort—exit merging and do not save the output.
Go into Fast mode. (In Edit mode, this is actually C-c C-c f.)
Go into Edit mode.
Recenter (like C-l) all three windows. With an argument, reestablish the default three-window display.
Specify part of a prefix numeric argument.
Also specify part of a prefix numeric argument.
Choose the A version as the default from here down in the merge buffer.
Choose the B version as the default from here down in the merge buffer.
Copy the A version of this difference into the kill ring.
Copy the B version of this difference into the kill ring.
Insert the A version of this difference at point.
Insert the B version of this difference at point.
Put point and mark around the difference.
Scroll all three windows down (like M-v).
Scroll all three windows up (like C-v).
Scroll all three windows left (like C-x <).
Scroll all three windows right (like C-x >).
Reset horizontal scroll on all three windows.
Shrink the merge window to one line. (Use C-u l to restore it to full size.)
Combine the two versions of this difference (see Combining in Emerge).
Show the names of the files/buffers Emerge is operating on, in a Help window. (Use C-u l to restore windows.)
Join this difference with the following one. (C-u x j joins this difference with the previous one.)
Split this difference into two differences. Before you use this command, position point in each of the three buffers at the place where you want to split the difference.
Trim identical lines off the top and bottom of the difference. Such lines occur when the A and B versions are identical but differ from the ancestor version.