+.SS "Output format"
+When a message is eventually received,
+.B xwait
+prints information about it to standard output:
+.hP \*o
+If more than one property (atom) was specified, the property name is
+printed.
+.hP \*o
+If more than one message is recognized for the property, the message
+string is printed; if a property name was printed, the two are separated
+by a colon and a single space character.
+.PP
+.B xwait
+then exits with return code 0.