# What process can generate a new write sequence

While compiling a very large document recently in xelatex and tex4ht I have observed that tex4ht doesn't handle write streams the same as xelatex. I am trying to prepare a MWE to troubleshoot my problem that started when I added another type of glossary to my document. But I am unable to reproduce the problem in smaller documents.

I don't think it is is specifically a glossaries problem because the addition of this sixth glossary doesn't break in a MWE with only 1 example term of each. My broken project has nearly 10 thousand entries in a variety of files loaded before the \begin{document}. I am unaware of any entry limit in glossaries that would force a cap on the number of entries that can be searched within but I suppose this could be possible and difficult to isolate unless known about in advance.

I make pretty full use of TeX automations as a whole:

• cross references to document hierarchy using \ref{}
• cross references to figures, tables, and equations using \cref{}
• bibliography management for distinct parts, chapters, and sections using bibunits
• Six distinct types of glossaries, and the corresponding \makeindex, and \makeglossaries and printglossary[] calls for appearance customization
• I am sure there are others I use that I am missing.

I have tried to force write calls by including at least one of each in a MWE but I am unable to crash my MWE.

Could anyone provide any advice regarding:

• what other types of package calls create a new \write?
• Or what causes distinct new \write calls to be made multiple times from the same package.
• Or point me to documentation that describes tex4ht limitations regarding new \write?
• Maybe all this is unnecessary if tex4ht can be forced to permit extra new \write streams...
• tex4ht surely uses some extra \writes for cross referencing – michal.h21 Mar 29 '15 at 0:07
• Why do you think it is a write problem? – cfr Mar 29 '15 at 0:24
• @cfr Please excuse the more difficult inline formatting for the sake of presenting my error message from the console in this comment. The error that I get is ! No room for a new \write . \alloc@ ...else \errmessage {No room for a new #2} fi \fi l.73 \end{document} ? and according to numerous questions on this site, this usually is a write problem associated with glossaries – EngBIRD Mar 29 '15 at 0:32
• Have you tried morewrites? – cfr Mar 29 '15 at 0:33
• @cfr That was easy! Nice answer. I would be happy to accept this in answer form! I had not tried it, because I remembered reading something that discouraged this. I instead was trying to use etex and scrwfile. If I can find this question again, I will post as a comment for interests sake. – EngBIRD Mar 29 '15 at 0:38