Can I use the Twitter apps without a Twitter account??
No. To use the app you need a Twitter account. You can create an account here:
Can I register the Twitter account with this app?
No. The app must be authorized for use at Twitter. For this purpose, a user account must already exist.
Can I use the app, without having previously used Twitter?
When a Twitter account exists, then yes.
I get the error message: Rate limit exceeded. What does that mean?
Rate limits are maximum calls set by Twitter to a specific resource. This can not be changed by the app. The limits can be found at:
Can I have multiple Twitter Apps by sg-soft run in parallel?
Yes. The apps run independently of each other.