No, it will work in the same way as Ingmar’s example above. But, if you only want to display one or a select choice of weblogs at the time, you can work with embeds and url_segements.
Let’s say you add weblog_short_name “about” to your URL. Then you can pass it to an embed. First you have to create a new template, for instance “content” where you have the exp:weblog:entries tag, custom fields and whatever you want to show. But, you leave the weblog parameter open for an embed variable.
In the main template you write (you can use any word for section here or use any segment):
{if segment_1=="about"} {embed={my_template_group}content section="about"} {if:else} other conditionals{/if}
In the embed you add to the parameter weblog in the weblog:entries tag the following:
You craft what is displayed, never forget that!