@node Advanced C-x C-q
@subsubsection Advanced Control in @kbd{C-x C-q}
+@cindex specify version number to check in/out
When you give a prefix argument to @code{vc-next-action} (@kbd{C-u
C-x C-q}), it still performs the next logical version control
operation, but accepts additional arguments to specify precisely how
the repository.
@item
+@cindex specify name of version control system
Instead of the version number, you can also specify the name of a
version control system. This is useful when one file is being managed
with two version control systems at the same time (@pxref{Local
version by typing @kbd{C-x C-q}.
@vindex vc-default-init-version
+@cindex specify initial version number to register
The initial version number for a newly registered file is 1.1, by
default. You can specify a different default by setting the variable
@code{vc-default-init-version}, or you can give @kbd{C-x v i} a numeric