The answer lies in com.google.gwt.i18n.client.Dictionary

If the entrypoint module is reachable thro /MakeAGoodGuess/
Employer.jsp,

then the url you could use is /MakeAGoodGuess/Employer.jsp/pg3.

Presuming
- you know how to parse the subpath of request url from the request
object of the jsp page,
- you know how to use java code in a jsp,
- you are familiar with json
construct a javascript tag enclosure and define a var as dictated by
javadoc of gwt Dictionary class. That var would be a json structure
contain all the info you wish to pass to the entrypoint module. But if
you won't need to pass a whole load of params, you don't need a json
structure but just

var pg = 3;

At the entry point onModuleLoad, use Dictionary to extract that var.

Then just use TabLayoutPanel selectTab method to select tab 3.

If you have a whole load of params to pass from jsp used to load the
module to the entrypoint module, you might as well define a var
assigned to a json structure.

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