From the Heritage analysis:
CIRA creates an entirely new “temporary guest worker” (H-2C) program. There is nothing temporary about this program; nearly all “guest workers” would have the right to become permanent residents and then citizens.

Foreign workers could enter the U.S. as guest workers if they have a job offer from a U.S. employer. In practical terms, U.S. companies would recruit foreign workers to enter the guest worker program and immigrate to the U.S. Most likely, intermediate employment firms would specialize in recruiting foreign labor for U.S. employers.

Guest workers would be allowed to remain in the U.S. for six years.[4] However, in the fourth year, the guest worker could ask for LPR status and would receive it if he has learned English or is enrolled in an English class.[5] There are no numeric limits on the number of guest workers who could receive LPR status. Upon receiving LPR status, the guest worker could remain in the country permanently. He could become a U.S. citizen and vote in U.S. elections after just five more years.

The spouses and minor children of guest workers would also be permitted to immigrate to the U.S.[6] When guest workers petition for LPR status, their spouses and children would receive it as well. Five years after obtaining LPR status, these spouses could become naturalized citizens. The bill sets no limit on the number of spouses and children who could immigrate under the guest worker program. After workers and their spouses have obtained citizenship, they would be able to bring in their parents as legal permanent residents.

The bill does provide numeric limits on the number of guest workers who can enter the country each year, but the number starts high and then grows exponentially. In the first year, 325,000 H-2C visas would be given out, but if employer demand for guest workers is high, that number could be boosted by an extra 65,000 in the next year. If employer demand for H-2C workers continues to be high, the number of H-2C visas could be raised by up to 20 percent in each subsequent year.

The 20 percent exponential escalator provision allows the number of H-2C immigrants to climb steeply in future years. If the H-2C cap were increased by 20 percent each year, within twenty years the annual inflow of workers would reach 12 million. At this 20 percent growth rate, a total of 70 million guest workers would enter the U.S. over the next two decades and none would be required to leave. While it is unlikely that so many workers would enter, the program does have the potential to bring ten of millions of immigrants to the U.S.

The “guest worker” program, then, is an open door program, based on the demands of U.S. business, that would allow an almost unlimited number of workers and dependents to enter the U.S. from anywhere in world and become citizens. It is essentially an “open border” provision.