GSM library multi connection

Hello to you!
Are there any of you who used the GSM library, combined with many connections simultaneously. I have tried but failed. I can’t find documentation the library that relate to this topic. Libraries GSM3ShieldV1MultiClientProvider and GSM3ShieldV1MultiServerProvider never used in other libraries. Does anyone have a solution or an example I am grateful.

Better documentation on the library is required!

/ Marcus