# User Portlet

Robert Jacobson
Discussions
What is the difference between UndocumentedTestFEParserPacket and ReparseBoxStructurePacket? I am aware of [John Fultz’s explanation of UndocumentedTestFEParserPacket][1] on SE. But I don’t understand its relationship to...
The tutorial [Controlling Infinite Evaluation][1] says: > When the Wolfram Language stops without finishing evaluation, it returns a held result. You can continue the evaluation by explicitly calling ReleaseHold. It includes this minimal...