Limit to distribute

I'm trying to use --limit and --skip option in Hascat 3.40 and I don't understand the way to use these options...
According help on the command line, -l is : "Limit X words from the start + skipped words"

After multiple attempts, it seems to work with restore points. I tried to understand Restore Points but it is not very clear for me. Is it right ?

My goal is to split my hash computing on diffrent computers not in the same place and to manage work session.

I didn't find answer in forums, Google, Wiki...

Sorry for my poor english :-)

Many thanks for this incredible software.
This question was already answered a couple of times, please use the forum search.
It doesn't work in my case.

hashcat64 --keyspace -a 3 -1 ?s?l?d ?1?1?1?1?1?1?1
You need to specify a mask if you specify a custom-charset

But I think I understood with your link and some others threads about loop mask.
Really thanks for the link. I missed this thread.
This is a known issue of the current release version (3.40): see

You could use the beta version which includes the fix ( or wait for the next release version (3.50? no release date yet)
Really a great thanks for all these detailed answers !!
I will wait next release. It's not a critical issue for me.