For most applications, individual buttons on a Rangecast player will be dedicated to individual broadcast channels. But there are times when it's useful to pool content from related agencies, and have a single control button for controlling on/off selection of the set of channels as a single block.
For example, in trunked radio systems, a city may have dozens of tactical channels available for fireground operations. Giving each tactical channel its own button on a primary monitoring page can be unwieldy, and pooling all these channels together into a single button can make for easier management and practical use.
In the page shown here, the top row of buttons has pooled content from many channels - e.g. all traffic (fire and police) from each of Middlesex and Suffolk counties;
Row 1 - Pooled content from throughout counties: Each button presents fire traffic from all towns within a particular Massachusetts county
Row 2 - Pooled content from individual cities: Fire traffic from each of the 7 largest towns in Middlesex County (with all traffic from each town presented through a single button, regardless of whether it's a dispatch or fireground tactical channel);
Row 3 - Individual broadcast channels: Each individual broadcast channel from fire departments in two towns (Cambridge and Somerville) in this county
Of course, if too much content is pooled together into a single control button, the quantity of content is too large for practical use. But judicious use of wildcarding, especially with low-traffic broadcast channels, makes it pratical to access a large amount of content through a simplified user interface.