When you click on a calendar, it will display the list of bills as of the current day or, in the case of legislative sessions that have adjourned, where the bills sat ultimately died from legislative inaction.
The underlined letter for each calendar selection is the letter you can type to display that calendar, rather than clicking the description or the radio button. Because browsers used Alt and Ctrl keys for their own menu function, for MDN's calendar-selection page, only the plain letter will work.
In the earlier years of MDN's legislative database, that order was crucial to the possible passage or death of a bill, particularly in the Senate where filibusters could stop getting far enough down the calendar to take up a bill the person(s) filibustering wanted to stop.
In the House, the problem was that far more bills were reported out of committees than the chamber possibly could take up before the constitutionally mandated adjournment.
But in the years of legislative term limits, legislators have allowed the leadership effectively to ignore the order of bills on the calendars.
The list of calendars on this page is generic. In early years, the House had separate calendars for bills required to comply with federal requirements and for major bills placed by the Rules Committee on a special to avoid those bills getting clogged by the backlog of bills on the regular calendars awaiting action.
But because no bill remained on those calendars when the legislature adjourned, those calendars are not in the menu list.
HCBs (House committee bills) were authorized by House rules in 2017. As a result, there are HCB bills will not appear in prior years.
Rather than being introduced by an individual member, an HCB is drafted by a committee, if authorized by the speaker. The sponsor is the committee chair.
There are several calendars:
When there are no bills on a calendar, that calendar item will have a strike-out and be greyed. You can still call up that calendar page, but all you will get is a message that there are no bills on the calendar.
Interestingly, current House rules do not specifically establish the specific calendars, except for consent bills and federal-compliance bills. Instead, it's up to the speaker to establish the calendars.
The federal-compliance bill calendar is not on the calendar menu because because only one bill is on that calendar -- SB 771 in 1998. If that calendar ever gets a bill in a current year, the calendar option will be included.
Also, a now abandoned calendar for bills approved by the House Rules Committee to give those bills higher priority is not included in the calendar list since in the years that calendar existed, not a single bill was left on the calendar when the legislature adjourned.