In SimpleIDE, if you open up Help, you can select SimpleIDE User Guide (PDF), which has an explanation for most of the things that you can do with the IDE. It even explains the difference between loading to RAM or the EEPROM.
There is a boot loader internal to the Propeller that gets control when a reset or power-on occurs. It checks to see if a PC is connected to I/O pins 30/31 and, if so, attempts to download a program to RAM. If the PC commands it, the boot loader will attempt to write the new program in RAM to an EEPROM attached to I/O pins 28/29. The PC can also command the Propeller to halt after loading or to run the program in RAM. If there's no PC present, the boot loader attempts to load a program from EEPROM into RAM. If the checksum checks, the program in RAM is executed.
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