It depends on the program you use to host. There are many different ones, so it's hard to determine for which on you're asking.
mac: command and F5 pc: control and F5
If you have enabled cheats in your world on the PC edition, the command to toggle rain on or off is /toggledownfall.
The PC version is purchased exclusively from the Minecraft website.
Minecraft for the PC costs 26.95.
yes it does you have to buy minecraft PC
Yes minecraft pc better than all of the minecrafts.
No, not on Minecraft PC. You just use your mouse and keyboard.
There is only one version of Minecraft to buy for the PC.
You will have to rebuild them.
pc
Yes, go the Minecraft website (if you have full/ bought Minecraft) and sign in. Then click on download and head to the PC download.
There is no command block in minecraft. If you go to the Minecraft WiKi it will have all the information you need for anything in the game.