The help form searches the documentation and opens a web browser (using the user’s selected browser) to display the results.
See net/sendurl for information on how the user’s browser is launched to display help information.
(help "web browser" "firefox")
searches the documentation index for references that include the phrase “web browser” or “firefox.”
A (help id) form looks for documentation specific to the current binding of id. For example,
For the purposes of help, a for-label require introduces a binding without actually executing the net/url library – for cases when you want to check documentation, but cannot or do not want to run the providing module.
|(require scheme/gui) ; does not work in mzscheme|
|(require (for-label scheme/gui)) ; ok in mzscheme|
If id has no for-label and normal binding, then help lists all libraries that are known to export a binding for id.
(help #:search "web browser" firefox)
also searches the documentation index for references that include the phrase “web browser” or “firefox.”