Use a loopback system. UDP 0.0.0.0 any port, maintain constant
connection.
Then you can send yourself any commands and parse them for feedback to
do things such as manage multiple subpages at once.
Maybe send a command like: subpages=01, subpages=02, etc
Then a regex like: subpages=(01)?(02)? etc
And a capture group for each subpage: digital join, 'on value' matches
the number (eg. 01, 02, etc).
Jarrod