The remarks in the format above are found at U.S. stations only. Here is the decode:
AO2 = Automated station with precipitation type/intensity sensor
RAB02E11 = in the last hour, rain began at :02 after the hour and ended at :11 after the hour
SLP086 = sea level pressure 1008.6 hPa
P0000 = Trace of rain since last hourly METAR (ex. P0030 would be 00.30" since last hourly METAR)
60000 = Trace of rain since in last 3 hr or 6 hr period (total amount of rain since 00Z, 06Z, 12Z or 18Z observation - in this case since 18Z observation).
T02560194 = Temp is 25.6 C and dewpoint is 19.4 C (ASOS measures temperatures in F then converts them to C, so in this case it is measuring 78 F and 67 F, respectively)
56009 = Pressure tendency and change in last 3 hrs. In this case, "6" means it was decreasing then decreased more slowly, and it is 0.9 hPa lower now than 3 hours ago.
For U.S. METARs, all your answers can be found here:
http://tabacofamily.com/jtabaco/ispwx/swo/
It is the current FAA manual for weather observers. 15-18 is where the remarks section begins.