b88774c0_cation___SharePoint_Automation__Description
[Parameter Name] directory [Short Form] dir [Required] No [Example Usage] -directory c:\moss\webs\portal -dir c:\moss\webs\portal [Description] 
The virtual directory of the web application. If not specified then the directory will be c:\inetpub\wwwroot\wss\virtualdirectories\{hostheader}{port}
Create Web Application « SharePoint Automation
Description