Indicator for panel workfile page.
Syntax:		@ispanel
Return:		integer
Returns a 0 or 1 depending on whether the active workfile page is panel structured.
Examples
scalar ispanel = @ispanel
assigns the (0, 1) panel indicator to the scalar object ISPANEL.
series ids = @recode(@ispanel, @crossid, NA)
creates a series that contains the cross-section identifiers if a panel workfile, and NAs, if not.
Cross-references
See also 
    
@cellid and 
    
@crossid.