Hi, I'm Ashik. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP
You can have different poker accounts on different user accounts. But re your question, Yes Party Poker can know they are all originating from same computer by tracking the IP address of your Mac.
Your computer will have same kind of IP address irrespective of the account you are logged in. If you would like different IP address, then you can try VPN application which will give you option to change the IP address, location, country etc
Would you like to know more about VPN ?
Those kind of websites usually track IP address. Other than that, they shouldn't be able to track since you are logging from different user accounts. One account doesn't have access to other account's files and the preference files or cookies or library files used by one user account is exclusive to that account.
It is possible that that application is sharing or putting some check-files in system library folder (which is accessible or can be checked by all accounts).
You probably can't delete because those should be core files required to run that program. Even if you delete them, the app will create new ones.
There is one option. You can setup virtual operating systems on your Mac (install other OS inside your Mac like Windows or Linux) and then install that on each virtual OS. This will work.
In Windows, you definitely can achieve this by using VPN and/or Sandbox applications like Sandboxie --> http://www.sandboxie.com/
There are two ways to install Windows on your Mac. By Bootcamp or using Virtualization applications.
Bootcamp, see here --> https://support.apple.com/en-in/HT201468
If you install Windows via Bootcamp, then you have to restart your Mac to switch between Windows and Mac. But they will be independent and considered as two computers.
Another method is by virtualization. You can use Parallels or VMWare Fusion to achieve this.
Parallels --> http://www.parallels.com/products/desktop/
or VMWare Fusion --> http://www.vmware.com/products/fusion
You have to buy Windows operating system to install it on your Mac.
Bootcamp will only allow you to install one copy of Windows, so you can only run OS at a time - Mac or Windows.
But with Parallels or VMWare Fusion, you can run Mac and Windows at same time. I prefer VMWare Fusion.
Remember, according to the rules of that game, one user should have only one account. They track credit card activity, IP addreses, cookies etc and if they find any conflicts, they will close the account.
It is possible to run multiple different OS on your computer through virtualization and thus can have multiple accounts. But 20 accounts ? That's a lot. You can't run 20 different OS at a time. Your Mac can't handle it.
If that game is available for Linux, then you can grab a copy of Linux (any version which is free) and install it on your Mac via Virutalization applications like Parallels or VMWare. You can have as many as virual machines you want, but you can only run one at a time.
So you can install 20 copies of Linux independently and have the game run on it. But not at same time
Virualization is the best way. But I'm pretty sure sooner or later, they might be able to track these accounts and ban them.
I may have another suggestion. Why don't you get a Windows tablet (like Dell Venue 8 Pro) and setup the game on them. That is the safe way and you can get these tablets cheaper than Windows licence
Like this one --> http://www.ebay.com/itm/Dell-Venue-8-Pro-5830-Atom-Z3740D-1-33GHz-32GB-Windows-8-1-8-inch-Tablet-/162092208312?hash=item25bd72d0b8:g:jPwAAOSwShJXLUny
These are fully functional computers (not Android or iOS tablets) which can run most of all Windows software games like the party poker game. All you need is a VPN software on it and you are good to go. In fact, all of you can play at same time.
You know, each machine have their own ID called Mac Address. These are distinctive address assigned to a computer. One computer have one address. These games may have some algorithm to check them (we don't know what these games check since we don't have access to the programming details). Some games doesn't check these things but some do especially those are financial in nature. If this game only check software based things, then you can create mulitple users on multiple OS which can be installed via virtualization.
Multiple users on Mac OS X (without virtual OS) will not help as there is a chance that they may share same core library files and may result in ban.
Well, for 20 accounts it is better to get different computers like Dell Venue 8 Pro Windows tablet.
You can test virtualization if you want. I can't guranatee it will be ban-proof. All though the virtualization OS are considered as different or isolated one, they are sharing same hardware of your Mac. 90% of the time, it shouldn't cause any problem as the program running running on each OS will be considered as different. Also, since they are sharing same IP address that may create problem.
Download a copy of VMWare Fusion and also download copy of Ubuntu (which is free). Then setup Ubuntu on VMWare Fusion. Load it and install that game on it. You can install as many Ubuntu Linux you want and have different copy of game on them. However, you will be able to load one Ubuntu Linux at a time on VMWare Fusion. You can install Windows same way instead of Ubuntu, but the issue is you have to buy individual license for each copy of Window you install.
Since you are handling 20 accounts, I think it'd be better you buy the Windows tablet (like the Venue 8 Pro Windows tablet). This way you are using different computers which is more safer to handle multiple accounts.
Yes, but it is too risky to run them all on same Mac. It may result in mass ban. I read that these games uses special codes to track IP, cookies and some other things to find out multiple accounts on same computer. In fact, it is not practical to create 50 accounts or virtualize 50 operating system on Mac. Your Mac can't handle it. For that, you have to build a very powerful PC with lots of space on drive.
I just read some forums about Party poker and found that many people's accounts are being blocked even when running the game on different computers, but on same network. So it seems like their limitation is 1 account per household. 50+ accounts on same computer even on virtualized OS is too risky.
Also if you create more than 10 user accounts on your Mac, it will affect the performance of your Mac as well.
If you make multiple virtual machine on your Mac, it will take up all the space in the driver and may affect the performance of your Mac. I believe it is not feasible to run 50+ poker accounts on same Mac.
Yes, but not all at once. Buy a few first (like 5) and test with them for some time. Remember, it is very important to use VPN or different WiFi connections on them. If you use same WiFi connection without VPN, they will detect it and may block it.
There are even cheaper Windows tablet or netbooks available than Venue 8 Pro. Might be better to do a search on eBay. Like this --> http://www.ebay.com/itm/CHUWI-Vi8-8-Intel-Quad-Core-Windows-8-2GB-32GB-Tablet-HDMI-/301966361629?var=&hash=item464e99041d:m:mSvFU2qfgH7Upxk8NstTsvQ
Venue 8 Pro is a decent one with good specs. You can attach keyboard and mouse on these tablets and these are fully functional computers.