As we mentioned in the introduction, <#47#><#47#> can easily communicate
with the Tk toolkit. All the commands
defined by the Tk toolkit are visible as <#50#>Tk-command<#50#>s, a basic
type recognized by the interpreter. <#51#>Tk-command<#51#>s can be called
like regular scheme procedures, serving as an entry point into the Tk
library.
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