Yes.
Most BNSF emulators will work on Windows 7. You may have to adjust how it runs, use compatability mode or other workarounds for some emulators, but they will eventually work.
Messenger is easy. you click and then you send a message that some one sent you to another friend.
windows, an emulator, and roms, internet browser
yes you can there is 3 emulators for ps2 in the emulator zone
Yes, it is legal to use NES emulators as long as you own the original game cartridges or have obtained the ROMs legally.
I believe there are emulators that you can use. https://www.androidauthority.com/best-android-emulators-for-pc-655308/
you can obtain emulators to play the legend of Zelda on a windows PC, which can run roms, The only downside is a very high processor usage rate, so only use if you have a high end computer, or a pretty recent one
There are several emulators to run other systems software on Windows, but there is nothing decent (as in working reliably with any software) for running Mac OS X software on Windows.
you can. you just have to download vbalink and open two emulators and go into the options and click on link
Yes, Unix emulators can run on Windows 7. Popular options include Cygwin and Windows Subsystem for Linux (WSL), though WSL requires Windows 10 or later. Cygwin provides a large collection of GNU and Open Source tools that provide functionality similar to a Unix environment. Additionally, virtualization software like VirtualBox can be used to run a full Unix/Linux distribution on Windows 7.
personaly i use nemu
Emulators are very complex and each model is different (even for the same emulated game system). Try going to the original site of the emulator for help operating them; usually, it just takes practice to use emulators proficiently.