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The doc you're referring to seems to have been moved here http://razberry.z-wave.me/docs/zway.pdf

Still no mention of .syscommands

As I download it this file is not complete either. After the index several pages seem to be missing. Paragraph numbers are drastically changed. It would be good if they put a date/version number on the frontpage.

The 4 pages file contains a link to a new one: http://razberry.z-wave.me/docs/zway.pdf

We have splitted h/w and s/w secific descriptions in two files.

It is in paragraph 17. Bue too short (we will update it soon). Here is a bit more detailed:
system(command_part1, command_part2, ...), where only command_ need to match one of .syscommands line, and the final executed command in shell would be made from concatenation of all command_partN.
.syscommands should be located in http_root/ folder

But still this document does have an incomplete index of only two pages. The next pages are blank. Then the text starts at page 7.

Please check this here - maybe it helps

http://en.z-wave.me/comment/1461#comment-1461

This information is at odds with the Zway manual which tells me at the end of section 17.1 (page 66)
system(command): executes an external command in shell and returns [ret code, output]. Command should start with one of the lines in http root/storage/.syscommand