Here's the explanation, and entry info, from the STPGA:
Qualifying for the 2006 Shell Houston Open, conducted by the Southern Texas PGA, will take place with a pair of events on Apr. 5 and Apr. 17.
The process has changed from previous years, in which a single “open” competition accounted for the qualifying process. This year, a Pre-Qualifier will precede the Open Qualifier.
The Pre-Qualifier will be held on Apr. 12 on the Tradition Course at Cypresswood Golf Club in Spring. The 18-hole stroke play competition is open to all professionals who are not 2006 PGA Tour or 2006 Nationwide Tour members and amateurs who possess a handicap index that, when applied to the qualifying course, will generate a handicap of 2.0 or less.
The top 50 (plus ties) golfers in the Pre-Qualifier will advance from the Pre-Qualifier to the Open Qualifying event, which will be held Apr. 17, also on the Tradition Course at Cypresswood.
The entry fee for the Pre-Qualifier is $200. Those golfers advancing to the 18-hole Open Qualifier will pay an additional $200 for that event. The low four (4) golfers in the Open Qualifier will advance to the Shell Houston Open, which will be played Apr. 20-23, 2006, on the Tournament Course at Redstone Golf Club in Humble.
Additional information about both events, including entry forms, is available on the “Tournaments” page of the Southern Texas PGA web site (www.stpga.com). The entry deadline is 5 p.m. CST on Friday, Apr. 7, 2006.