How to program outputs?

Just remember that a pin is an input if the corresponding bit in the associated TRISx register is set.
PMP has no specifiec built-in instruction for manipulating such register, simply affect a value directly to the register.

An example with TRISB:

TRISB := $­­­­­0F; // PORTB 0..3 as inputs, 4..7 as outputs
PORTB := $­­­­­F0; // set PORTB 4..7 high
TRISB.0 := false; // PORTB.0 as output, immediately set low (PORTB.0 was 0)
// Remember that every output pin has a latch even if it is set as an input, the latch works...

Manipulating the TRISx bit is a way to do fast 0 output with an external pullup (ofen used in bidirectional i/o such as I2C).

Another example with the full PMP syntax possibilities:

program test;
var
begin
end.

Help! There is no TRISx in my device!

For old and small devices that had no TRISx register, PMP (V1.05 and later) provides a special built-in procedure TRIS(Port, Mask) that maps to the TRISx register if it exists or to a TRIS instruction otherwise. The problem with TRIS instruction (of such device in fact) is that it is write only, you cannot read what is the current mask.