Specifies the display screen on which the Xv Server is to
accept requests from Xv clients. If the display option is not specified,
Xv uses the display screen specified by your DISPLAY environment variable.
The display option has the format hostname:number. Using two colons (::)
instead of one (:) indicates that DECnet is to be used for transport.
a drawable of the screen for which the adaptor information is desired.
A pointer to where the numer of adaptors for the specified
screen is returned.
A pointer to where the list of returned
adaptor information is returned.