+Each command obeys a common set of options. The general form is:
+.PP
+virt\-\fIprogram\fR [\-options] [domains...]
+.PP
+where \fIdomains\fR is a list of guest names to act on. If no domains
+are specified then we act on all active domains by default.
+.PP
+A \fIdomain\fR may be specified either by its name or by its \s-1ID\s0. Use
+\&\fIvirsh list\fR to get a list of active domain names and IDs.
+.PP
+The virt-mem tools do not work on domains which are not active
+(running or paused). eg. They do not work on shut down domains.