... char *hostname11
The name of the host may be symbolic (for example dxcern.cern.ch) or numeric (for example 128.141.201.96)
... channels.22
You can see from the description of connect/disconnect functions, that you can create more than one connection to servers simultaneously.

... as:33
If the NULL value is transferred as a parameter ``function'' to the functions, described below, the debugging will be turned off.
... char *out44
When the name of the local file is *STDIN*, *STDOUT*, *STDERR*, then the current stream is redirected to these channels
... expires.55
In different kernels timeout is different
... char *pat66
This is the first argument for ``ls'' command
... set.77
Of course, such functions as seek, ioctl, .... can not be used.
... set88
By default