There are a few standard tooltypes that apply to all programs in WBStartup, such as DONOTWAIT and STARTPRI. Info on these should be in the Workbench manual (that came with 3.0/3.1), or the HTML docs on the 3.5/3.9 CD.
Some programs have their own tooltypes, check the docs for those programs.
Edit: Tooltype explanations from the OS3.9 online docs.
DONOTWAIT
Normally the Workbench waits for one program to finish before it opens the next. DONOTWAIT overrides this, which can cause unwanted requesters after booting. DONOTWAIT does not take an argument.
WAIT=
Specifies how many seconds the Workbench should wait before opening the next icon in the WBStartup drawer.
STARTPRI=
Assigns a priority to an icon so that it opens before or after other icons. By default, all icons have a priority of 0. The acceptable range is from -128 to +127; the higher the value, the higher the program's priority.
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